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CVE-2026-4371

Out of bounds read in IMAP parsing

7.4 HighFix available

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
High

Exploit likelihood

0.38%Up 0.4 points since Mar 25, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.4

Out of bounds read in IMAP parsing

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Record
CVE-2026-4371
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weakness
CWE-126, CWE-130
Updated
2026-11-02
EUVDEUVD-2026-15023 8.2

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Record
EUVD-2026-15023
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-4p49-pghr-968w 7.4

A malicious mail server could send malformed strings with negative lengths, causing the parser to...

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability affects Thunderbird < 149 and Thunderbird < 140.9.

Record
GHSA-4p49-pghr-968w
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
CWE-126, CWE-130
Updated
2026-11-02
NVD 7.4

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Record
CVE-2026-4371
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weakness
CWE-126, CWE-130
Updated
2026-11-02
OSVDEBIAN-CVE-2026-4371 7.4

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Record
DEBIAN-CVE-2026-4371
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-1993 10.0

thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.(CVE-2025-59375)

Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-3889)

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-4371)

Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4684)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4685)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4686)

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4687)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4688)

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4689)

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4690)

Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4691)

Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4692)

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4693)

Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4694)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4695)

Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4696)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4697)

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149, Firefox ESR <…

Record
OESA-2026-1993
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
Show 24 moreShow less
OSVOESA-2026-1994 10.0

thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.(CVE-2025-59375)

Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-3889)

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-4371)

Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4684)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4685)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4686)

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4687)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4688)

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4689)

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4690)

Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4691)

Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4692)

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4693)

Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4694)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4695)

Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4696)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4697)

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149, Firefox ESR <…

Record
OESA-2026-1994
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:6188 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:6188
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:6342 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:6342
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:6917 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:6917
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8284 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8284
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8285 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8285
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8286 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8286
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8287 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8287
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8288 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8288
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8289 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8289
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8290 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8290
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8315 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8315
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:8850 8.2

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2026:8850
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:6188 8.2

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)

  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)

  • firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)

  • firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)

  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)

  • firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)

  • firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)

  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)

  • firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)

  • firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)

  • firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)

  • firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)

  • firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)

  • firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)

  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)

  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)

  • firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)

  • firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)

  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)

  • firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)

  • firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary…

Record
RLSA-2026:6188
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:6342 8.2

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)

  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)

  • firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)

  • firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)

  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)

  • firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)

  • firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)

  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)

  • firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)

  • firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)

  • firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)

  • firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)

  • firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)

  • firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)

  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)

  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)

  • firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)

  • firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)

  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)

  • firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)

  • firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary…

Record
RLSA-2026:6342
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:6917 8.2

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)

  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)

  • firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)

  • firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)

  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)

  • firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)

  • firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)

  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)

  • firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)

  • firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)

  • firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)

  • firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)

  • firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)

  • firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)

  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)

  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)

  • firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)

  • firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)

  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)

  • firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)

  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)

  • firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary…

Record
RLSA-2026:6917
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-4371 7.4

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Record
UBUNTU-CVE-2026-4371
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02
OSVALSA-2026:6188 No score

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)
  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)
  • firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)
  • firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)
  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)
  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)
  • firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)
  • firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)
  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)
  • firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)
  • firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)
  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)
  • firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)
  • firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)
  • firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)
  • firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)
  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)
  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)
  • firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)
  • firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)
  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)
  • firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)
  • firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)
  • firefox: thunderbird:…
Record
ALSA-2026:6188
Updated
2026-11-02
OSVALSA-2026:6342 No score

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)
  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)
  • firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)
  • firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)
  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)
  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)
  • firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)
  • firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)
  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)
  • firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)
  • firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)
  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)
  • firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)
  • firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)
  • firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)
  • firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)
  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)
  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)
  • firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)
  • firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)
  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)
  • firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)
  • firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)
  • firefox: thunderbird:…
Record
ALSA-2026:6342
Updated
2026-11-02
OSVALSA-2026:6917 No score

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)
  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)
  • firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)
  • firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)
  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)
  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)
  • firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)
  • firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)
  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)
  • firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)
  • firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)
  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)
  • firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)
  • firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)
  • firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)
  • firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)
  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)
  • firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)
  • firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)
  • firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)
  • firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)
  • firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)
  • firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)
  • firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)
  • firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)
  • firefox: thunderbird:…
Record
ALSA-2026:6917
Updated
2026-11-02
OSVCLSA-2026-1785560172 No score

thunderbird: Fix of 255 CVEs

  • rebase from Thunderbird 115.4.1 to 140.12.0 ESR

  • CVE-2022-3032: When receiving an HTML email that contained an iframe element, which used a srcdoc attribute to define the inner HTML document, remote objects specified in the nested document, for example images or videos, were not blocked

  • CVE-2023-0430: Certificate OCSP revocation status was not checked when verifying S/Mime signatures

  • CVE-2023-0547: OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be accepted

  • CVE-2023-0616: If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to process and display the message, which could cause Thunderbird's user interface to lock up and no longer respond to the user's actions

  • CVE-2023-1945: Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially exploitable crash

  • CVE-2023-4573: When receiving rendering data over IPC mStream could have been destroyed when initialized, which could have led to a use-after-free causing a potentially exploitable crash

  • CVE-2023-4574: When creating a callback over IPC for showing the Color Picker window, multiple of the same callbacks could have been created at a time and eventually all simultaneously destroyed as soon as one of the callbacks finished

  • CVE-2023-4575: When creating a callback over IPC for showing the File Picker window, multiple of the same callbacks could have been created at a time and eventually all simultaneously destroyed as soon as one of the callbacks finished

  • CVE-2023-4577: When UpdateRegExpStatics attempted to access initialStringHeap it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash

  • CVE-2023-4578: When calling JS::CheckRegExpSyntax a Syntax Error could have been set which would end in calling convertToRuntimeErrorAndClear. A path in the function could attempt to allocate memory when none is available which would have caused a newly created Out of Memory exception to be mishandled as a Syntax Error

  • CVE-2023-4580: Push notifications stored on disk in private browsing mode were not being encrypted potentially allowing the leak of sensitive information

  • CVE-2023-4581: Excel .xll add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm

  • CVE-2023-5169: A compromised content process could have provided malicious data in a PathRecording resulting in an out-of-bounds write, leading to a potentially exploitable crash in a privileged process

  • CVE-2023-5171: During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NUL bytes, and cause a potentially exploitable crash

  • CVE-2023-5724: Drivers are not always robust to extremely large draw calls and in some cases this scenario could have led to a crash

  • CVE-2023-5725: A malicious installed WebExtension could open arbitrary URLs, which under the right circumstance could be leveraged to collect sensitive user data

  • CVE-2023-5732: An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited

  • CVE-2023-6204: On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element

  • CVE-2023-6205: It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to an exploitable crash

  • CVE-2023-6206: The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay on permission prompts

  • CVE-2023-6207: Ownership…

Record
CLSA-2026-1785560172
Updated
2026-11-02
OSVopenSUSE-SU-2026:10447-1 No score

MozillaThunderbird-140.9.0-1.1 on GA media

These are all security issues fixed in the MozillaThunderbird-140.9.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10447-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20664-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

Changes in MozillaThunderbird:

  • Mozilla Thunderbird 140.10.0 ESR

    • Newly translated strings were not available in Thunderbird MFSA 2026-34 (bsc#1262230)
    • CVE-2026-6746 Use-after-free in the DOM: Core & HTML component
    • CVE-2026-6747 Use-after-free in the WebRTC component
    • CVE-2026-6748 Uninitialized memory in the Audio/Video: Web Codecs component
    • CVE-2026-6749 Information disclosure due to uninitialized memory in the Graphics: Canvas2D component
    • CVE-2026-6750 Privilege escalation in the Graphics: WebRender component
    • CVE-2026-6751 Uninitialized memory in the Audio/Video: Web Codecs component
    • CVE-2026-6752 Incorrect boundary conditions in the WebRTC component
    • CVE-2026-6753 Incorrect boundary conditions in the WebRTC component
    • CVE-2026-6754 Use-after-free in the JavaScript Engine component
    • CVE-2026-6757 Invalid pointer in the JavaScript: WebAssembly component
    • CVE-2026-6759 Use-after-free in the Widget: Cocoa component
    • CVE-2026-6761 Privilege escalation in the Networking component
    • CVE-2026-6762 Spoofing issue in the DOM: Core & HTML component
    • CVE-2026-6763 Mitigation bypass in the File Handling component
    • CVE-2026-6764 Incorrect boundary conditions in the DOM: Device Interfaces component
    • CVE-2026-6765 Information disclosure in the Form Autofill component
    • CVE-2026-6766 Incorrect boundary conditions in the Libraries component in NSS
    • CVE-2026-6767 Other issue in the Libraries component in NSS
    • CVE-2026-6769 Privilege escalation in the Debugger component
    • CVE-2026-6770 Other issue in the Storage: IndexedDB component
    • CVE-2026-6771 Mitigation bypass in the DOM: Security component
    • CVE-2026-6772 Incorrect boundary conditions in the Libraries component in NSS
    • CVE-2026-6776 Incorrect boundary conditions in the WebRTC: Networking component
    • CVE-2026-6785 Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150
    • CVE-2026-6786 Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150

  • Mozilla Thunderbird 140.9.1 ESR MFSA 2026-29

    • CVE-2026-5732 Incorrect boundary conditions, integer overflow in the Graphics: Text component
    • CVE-2026-5731 Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
    • CVE-2026-5734 Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

  • Mozilla Thunderbird 140.9.0 ESR MFSA 2026-24 (bsc#1260083)

    • CVE-2026-3889 Spoofing issue in Thunderbird
    • CVE-2026-4371 Out of bounds read in IMAP parsing
    • CVE-2026-4684 Race condition, use-after-free in the Graphics: WebRender component
    • CVE-2026-4685 Incorrect boundary conditions in the Graphics: Canvas2D component
    • CVE-2026-4686 Incorrect boundary conditions in the Graphics: Canvas2D component
    • CVE-2026-4687 Sandbox escape due to incorrect boundary conditions in the Telemetry component
    • CVE-2026-4688 Sandbox escape due to use-after-free in the Disability Access APIs component
    • CVE-2026-4689 Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
    • CVE-2026-4690 Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
    • CVE-2026-4691 Use-after-free in the CSS Parsing and Computation component
    • CVE-2026-4692 Sandbox escape in the Responsive Design Mode component
    • CVE-2026-4693 Incorrect boundary conditions in the Audio/Video: Playback component
    • CVE-2026-4694 Incorrect boundary conditions, integer overflow in the Graphics component
    • CVE-2026-4695 Incorrect boundary conditions in the Audio/Video: Web Codecs component
    • CVE-2026-4696 Use-after-free in the Layout: Text and Fonts component
    • CVE-2026-4697 Incorrect boundary conditions in the…
Record
openSUSE-SU-2026:20664-1
Updated
2026-11-02
OSVSUSE-SU-2026:1163-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

Update to Mozilla Thunderbird 140.9 (MFSA 2026-24, bsc#1260083):

  • CVE-2026-3889: Spoofing issue in Thunderbird
  • CVE-2026-4371: Out of bounds read in IMAP parsing
  • CVE-2026-4684: Race condition, use-after-free in the Graphics: WebRender component
  • CVE-2026-4685: Incorrect boundary conditions in the Graphics: Canvas2D component
  • CVE-2026-4686: Incorrect boundary conditions in the Graphics: Canvas2D component
  • CVE-2026-4687: Sandbox escape due to incorrect boundary conditions in the Telemetry component
  • CVE-2026-4688: Sandbox escape due to use-after-free in the Disability Access APIs component
  • CVE-2026-4689: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
  • CVE-2026-4690: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
  • CVE-2026-4691: Use-after-free in the CSS Parsing and Computation component
  • CVE-2026-4692: Sandbox escape in the Responsive Design Mode component
  • CVE-2026-4693: Incorrect boundary conditions in the Audio/Video: Playback component
  • CVE-2026-4694: Incorrect boundary conditions, integer overflow in the Graphics component
  • CVE-2026-4695: Incorrect boundary conditions in the Audio/Video: Web Codecs component
  • CVE-2026-4696: Use-after-free in the Layout: Text and Fonts component
  • CVE-2026-4697: Incorrect boundary conditions in the Audio/Video: Web Codecs component
  • CVE-2026-4698: JIT miscompilation in the JavaScript Engine: JIT component
  • CVE-2026-4699: Incorrect boundary conditions in the Layout: Text and Fonts component
  • CVE-2026-4700: Mitigation bypass in the Networking: HTTP component
  • CVE-2026-4701: Use-after-free in the JavaScript Engine component
  • CVE-2026-4702: JIT miscompilation in the JavaScript Engine component
  • CVE-2026-4704: Denial-of-service in the WebRTC: Signaling component
  • CVE-2026-4705: Undefined behavior in the WebRTC: Signaling component
  • CVE-2026-4706: Incorrect boundary conditions in the Graphics: Canvas2D component
  • CVE-2026-4707: Incorrect boundary conditions in the Graphics: Canvas2D component
  • CVE-2026-4708: Incorrect boundary conditions in the Graphics component
  • CVE-2026-4709: Incorrect boundary conditions in the Audio/Video: GMP component
  • CVE-2026-4710: Incorrect boundary conditions in the Audio/Video component
  • CVE-2026-4711: Use-after-free in the Widget: Cocoa component
  • CVE-2026-4712: Information disclosure in the Widget: Cocoa component
  • CVE-2026-4713: Incorrect boundary conditions in the Graphics component
  • CVE-2026-4714: Incorrect boundary conditions in the Audio/Video component
  • CVE-2026-4715: Uninitialized memory in the Graphics: Canvas2D component
  • CVE-2026-4716: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component
  • CVE-2026-4717: Privilege escalation in the Netmonitor component
  • CVE-2025-59375: Denial-of-service in the XML component
  • CVE-2026-4718: Undefined behavior in the WebRTC: Signaling component
  • CVE-2026-4719: Incorrect boundary conditions in the Graphics: Text component
  • CVE-2026-4720: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
  • CVE-2026-4721: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
Record
SUSE-SU-2026:1163-1
Updated
2026-11-02

Affected products

Show 7 moreShow less

Affected packages

Affected packages
PackageAffectedFixed
thunderbird
AlmaLinux:9
From an advisory covering 39 CVEs
 before 140.9.0-1.el9_7.alma.1
140.9.0-1.el9_7.alma.1
thunderbird
AlmaLinux:10
From an advisory covering 39 CVEs
 before 140.9.0-1.el10_1.alma.1
140.9.0-1.el10_1.alma.1
thunderbird
AlmaLinux:8
From an advisory covering 39 CVEs
 before 140.9.0-1.el8_10.alma.1
140.9.0-1.el8_10.alma.1
thunderbird
TuxCare:AlmaLinux:9.2
From an advisory covering 253 CVEs
 before 140.12.0-1.el9_2.alma.1.tuxcare.els1
140.12.0-1.el9_2.alma.1.tuxcare.els1
thunderbird
Debian:12
 before 1:140.9.0esr-1~deb12u1, plus listed versions
1:102.11.0-11:102.12.0-11:102.12.0-1~deb10u11:102.12.0-1~deb11u11:102.12.0-1~deb12u1
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1:102.13.0-11:102.13.0-1~deb10u11:102.13.0-1~deb11u11:102.13.0-1~deb12u11:102.13.1-11:102.13.1-1~deb10u11:102.13.1-1~deb11u11:102.13.1-1~deb12u11:102.14.0-1~deb10u11:102.14.0-1~deb11u11:102.14.0-1~deb12u11:102.15.0-1~deb10u11:102.15.0-1~deb11u11:102.15.0-1~deb12u11:102.15.1-1~deb10u11:102.15.1-1~deb11u11:102.15.1-1~deb12u11:103.0~b5-11:104.0~b2-11:110.0~b4-11:112.0~b1-11:113.0~b3-11:114.0~b2-11:115.0-11:115.0.1-11:115.0.1-21:115.0~b4-11:115.0~b6-11:115.1.0-11:115.1.1-11:115.10.1-11:115.10.1-1~deb10u11:115.10.1-1~deb11u11:115.10.1-1~deb12u11:115.11.0-11:115.11.0-1~deb10u11:115.11.0-1~deb11u11:115.11.0-1~deb12u11:115.12.0-11:115.12.0-1~deb10u11:115.12.0-1~deb11u11:115.12.0-1~deb12u11:115.13.0-11:115.13.0-1~deb11u11:115.13.0-1~deb12u1
1:140.9.0esr-1~deb12u1
thunderbird
Debian:13
 before 1:140.9.0esr-1~deb13u1, plus listed versions
1:128.13.0esr-11:128.14.0esr-11:128.14.0esr-1~deb11u11:128.14.0esr-1~deb12u11:128.14.0esr-1~deb13u1
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1:129.0~b6-11:130.0~b3-11:132.0~b6-11:135.0-11:136.0-11:137.0-11:138.0-11:140.0.1esr-11:140.1.0esr-11:140.1.1esr-11:140.2.0esr-11:140.3.0esr-11:140.3.0esr-1~deb11u11:140.3.0esr-1~deb12u11:140.3.0esr-1~deb13u11:140.3.1esr-11:140.4.0esr-11:140.4.0esr-1~deb11u11:140.4.0esr-1~deb12u11:140.4.0esr-1~deb13u11:140.5.0esr-11:140.5.0esr-1~deb11u11:140.5.0esr-1~deb12u11:140.5.0esr-1~deb13u11:140.6.0esr-11:140.6.0esr-1~deb11u11:140.6.0esr-1~deb12u11:140.6.0esr-1~deb13u11:140.7.0esr-11:140.7.0esr-1~deb11u11:140.7.0esr-1~deb12u11:140.7.0esr-1~deb13u11:140.7.1esr-11:140.7.1esr-1~deb11u11:140.7.1esr-1~deb12u11:140.7.1esr-1~deb13u11:140.8.0esr-11:140.8.0esr-1~deb11u11:140.8.0esr-1~deb12u11:140.8.0esr-1~deb13u11:140.9.0esr-1~deb11u11:140.9.0esr-1~deb12u1
1:140.9.0esr-1~deb13u1
thunderbird
Debian:14
 before 1:140.9.0esr-1, plus listed versions
1:128.13.0esr-11:128.14.0esr-11:128.14.0esr-1~deb11u11:128.14.0esr-1~deb12u11:128.14.0esr-1~deb13u1
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1:129.0~b6-11:130.0~b3-11:132.0~b6-11:135.0-11:136.0-11:137.0-11:138.0-11:140.0.1esr-11:140.1.0esr-11:140.1.1esr-11:140.2.0esr-11:140.3.0esr-11:140.3.0esr-1~deb11u11:140.3.0esr-1~deb12u11:140.3.0esr-1~deb13u11:140.3.1esr-11:140.4.0esr-11:140.4.0esr-1~deb11u11:140.4.0esr-1~deb12u11:140.4.0esr-1~deb13u11:140.5.0esr-11:140.5.0esr-1~deb11u11:140.5.0esr-1~deb12u11:140.5.0esr-1~deb13u11:140.6.0esr-11:140.6.0esr-1~deb11u11:140.6.0esr-1~deb12u11:140.6.0esr-1~deb13u11:140.7.0esr-11:140.7.0esr-1~deb11u11:140.7.0esr-1~deb12u11:140.7.0esr-1~deb13u11:140.7.1esr-11:140.7.1esr-1~deb11u11:140.7.1esr-1~deb12u11:140.7.1esr-1~deb13u11:140.8.0esr-11:140.8.0esr-1~deb11u11:140.8.0esr-1~deb12u11:140.8.0esr-1~deb13u11:140.9.0esr-1~deb11u11:140.9.0esr-1~deb12u11:140.9.0esr-1~deb13u1
1:140.9.0esr-1
thunderbird
Debian:11
From an advisory covering 38 CVEs
 before 1:140.9.0esr-1~deb11u1, plus listed versions
1:102.0.1-11:102.0.2-11:102.0~b4-11:102.0~b7-11:102.1.0-1
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1:102.1.1-11:102.1.2-11:102.10.0-11:102.10.0-1~deb10u11:102.10.0-1~deb11u11:102.11.0-11:102.11.0-1~deb10u11:102.11.0-1~deb11u11:102.12.0-11:102.12.0-1~deb10u11:102.12.0-1~deb11u11:102.12.0-1~deb12u11:102.13.0-11:102.13.0-1~deb10u11:102.13.0-1~deb11u11:102.13.0-1~deb12u11:102.13.1-11:102.13.1-1~deb10u11:102.13.1-1~deb11u11:102.13.1-1~deb12u11:102.14.0-1~deb10u11:102.14.0-1~deb11u11:102.14.0-1~deb12u11:102.15.0-1~deb10u11:102.15.0-1~deb11u11:102.15.0-1~deb12u11:102.15.1-1~deb10u11:102.15.1-1~deb11u11:102.15.1-1~deb12u11:102.2.0-11:102.2.1-11:102.2.2-11:102.3.0-11:102.3.0-1~deb10u11:102.3.0-1~deb11u11:102.3.1-11:102.3.2-11:102.3.3-11:102.4.0-11:102.4.0-1~deb10u11:102.4.0-1~deb11u11:102.4.1-11:102.5.0-11:102.5.0-1~deb10u11:102.5.0-1~deb11u1
1:140.9.0esr-1~deb11u1
thunderbird
Debian:12
From an advisory covering 38 CVEs
 before 1:140.9.0esr-1~deb12u1, plus listed versions
1:102.11.0-11:102.12.0-11:102.12.0-1~deb10u11:102.12.0-1~deb11u11:102.12.0-1~deb12u1
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1:102.13.0-11:102.13.0-1~deb10u11:102.13.0-1~deb11u11:102.13.0-1~deb12u11:102.13.1-11:102.13.1-1~deb10u11:102.13.1-1~deb11u11:102.13.1-1~deb12u11:102.14.0-1~deb10u11:102.14.0-1~deb11u11:102.14.0-1~deb12u11:102.15.0-1~deb10u11:102.15.0-1~deb11u11:102.15.0-1~deb12u11:102.15.1-1~deb10u11:102.15.1-1~deb11u11:102.15.1-1~deb12u11:103.0~b5-11:104.0~b2-11:110.0~b4-11:112.0~b1-11:113.0~b3-11:114.0~b2-11:115.0-11:115.0.1-11:115.0.1-21:115.0~b4-11:115.0~b6-11:115.1.0-11:115.1.1-11:115.10.1-11:115.10.1-1~deb10u11:115.10.1-1~deb11u11:115.10.1-1~deb12u11:115.11.0-11:115.11.0-1~deb10u11:115.11.0-1~deb11u11:115.11.0-1~deb12u11:115.12.0-11:115.12.0-1~deb10u11:115.12.0-1~deb11u11:115.12.0-1~deb12u11:115.13.0-11:115.13.0-1~deb11u11:115.13.0-1~deb12u1
1:140.9.0esr-1~deb12u1
thunderbird
Debian:13
From an advisory covering 38 CVEs
 before 1:140.9.0esr-1~deb13u1, plus listed versions
1:128.13.0esr-11:128.14.0esr-11:128.14.0esr-1~deb11u11:128.14.0esr-1~deb12u11:128.14.0esr-1~deb13u1
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1:129.0~b6-11:130.0~b3-11:132.0~b6-11:135.0-11:136.0-11:137.0-11:138.0-11:140.0.1esr-11:140.1.0esr-11:140.1.1esr-11:140.2.0esr-11:140.3.0esr-11:140.3.0esr-1~deb11u11:140.3.0esr-1~deb12u11:140.3.0esr-1~deb13u11:140.3.1esr-11:140.4.0esr-11:140.4.0esr-1~deb11u11:140.4.0esr-1~deb12u11:140.4.0esr-1~deb13u11:140.5.0esr-11:140.5.0esr-1~deb11u11:140.5.0esr-1~deb12u11:140.5.0esr-1~deb13u11:140.6.0esr-11:140.6.0esr-1~deb11u11:140.6.0esr-1~deb12u11:140.6.0esr-1~deb13u11:140.7.0esr-11:140.7.0esr-1~deb11u11:140.7.0esr-1~deb12u11:140.7.0esr-1~deb13u11:140.7.1esr-11:140.7.1esr-1~deb11u11:140.7.1esr-1~deb12u11:140.7.1esr-1~deb13u11:140.8.0esr-11:140.8.0esr-1~deb11u11:140.8.0esr-1~deb12u11:140.8.0esr-1~deb13u11:140.9.0esr-1~deb11u1
1:140.9.0esr-1~deb13u1
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Affected packages
PackageAffectedFixed
thunderbird
openEuler:24.03-LTS-SP2
From an advisory covering 40 CVEs
 before 140.9.1-1.oe2403sp2
140.9.1-1.oe2403sp2
thunderbird
openEuler:24.03-LTS-SP3
From an advisory covering 40 CVEs
 before 140.9.1-1.oe2403sp3
140.9.1-1.oe2403sp3
thunderbird
Red Hat:enterprise_linux:9::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_7
0:140.9.0-1.el9_7
thunderbird-debuginfo
Red Hat:enterprise_linux:9::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_7
0:140.9.0-1.el9_7
thunderbird-debugsource
Red Hat:enterprise_linux:9::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_7
0:140.9.0-1.el9_7
thunderbird
Red Hat:enterprise_linux:10.1
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_1
0:140.9.0-1.el10_1
thunderbird-debuginfo
Red Hat:enterprise_linux:10.1
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_1
0:140.9.0-1.el10_1
thunderbird-debugsource
Red Hat:enterprise_linux:10.1
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_1
0:140.9.0-1.el10_1
thunderbird
Red Hat:enterprise_linux:8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_10
0:140.9.0-1.el8_10
thunderbird-debuginfo
Red Hat:enterprise_linux:8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_10
0:140.9.0-1.el8_10
thunderbird-debugsource
Red Hat:enterprise_linux:8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_10
0:140.9.0-1.el8_10
thunderbird
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_6
0:140.9.0-1.el9_6
thunderbird-debuginfo
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_6
0:140.9.0-1.el9_6
thunderbird-debugsource
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_6
0:140.9.0-1.el9_6
thunderbird
Red Hat:rhel_aus:8.2::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_2
0:140.9.0-1.el8_2
thunderbird-debuginfo
Red Hat:rhel_aus:8.2::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_2
0:140.9.0-1.el8_2
thunderbird-debugsource
Red Hat:rhel_aus:8.2::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_2
0:140.9.0-1.el8_2
thunderbird
Red Hat:rhel_e4s:9.0::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_0
0:140.9.0-1.el9_0
thunderbird-debuginfo
Red Hat:rhel_e4s:9.0::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_0
0:140.9.0-1.el9_0
thunderbird-debugsource
Red Hat:rhel_e4s:9.0::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_0
0:140.9.0-1.el9_0
thunderbird
Red Hat:rhel_e4s:9.2::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_2
0:140.9.0-1.el9_2
thunderbird-debuginfo
Red Hat:rhel_e4s:9.2::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_2
0:140.9.0-1.el9_2
thunderbird-debugsource
Red Hat:rhel_e4s:9.2::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_2
0:140.9.0-1.el9_2
thunderbird
Red Hat:rhel_e4s:8.8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_8
0:140.9.0-1.el8_8
thunderbird-debuginfo
Red Hat:rhel_e4s:8.8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_8
0:140.9.0-1.el8_8
thunderbird-debugsource
Red Hat:rhel_e4s:8.8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_8
0:140.9.0-1.el8_8
thunderbird
Red Hat:rhel_tus:8.8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_8
0:140.9.0-1.el8_8
thunderbird-debuginfo
Red Hat:rhel_tus:8.8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_8
0:140.9.0-1.el8_8
thunderbird-debugsource
Red Hat:rhel_tus:8.8::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_8
0:140.9.0-1.el8_8
thunderbird
Red Hat:rhel_aus:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird-debuginfo
Red Hat:rhel_aus:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird-debugsource
Red Hat:rhel_aus:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird
Red Hat:rhel_e4s:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird-debuginfo
Red Hat:rhel_e4s:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird-debugsource
Red Hat:rhel_e4s:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird
Red Hat:rhel_tus:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird-debuginfo
Red Hat:rhel_tus:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird-debugsource
Red Hat:rhel_tus:8.6::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_6
0:140.9.0-1.el8_6
thunderbird
Red Hat:rhel_eus:9.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_4
0:140.9.0-1.el9_4
thunderbird-debuginfo
Red Hat:rhel_eus:9.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_4
0:140.9.0-1.el9_4
thunderbird-debugsource
Red Hat:rhel_eus:9.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_4
0:140.9.0-1.el9_4
thunderbird
Red Hat:enterprise_linux_eus:10.0
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_0
0:140.9.0-1.el10_0
thunderbird-debuginfo
Red Hat:enterprise_linux_eus:10.0
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_0
0:140.9.0-1.el10_0
thunderbird-debugsource
Red Hat:enterprise_linux_eus:10.0
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_0
0:140.9.0-1.el10_0
thunderbird
Red Hat:rhel_aus:8.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_4
0:140.9.0-1.el8_4
thunderbird-debuginfo
Red Hat:rhel_aus:8.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_4
0:140.9.0-1.el8_4
thunderbird-debugsource
Red Hat:rhel_aus:8.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_4
0:140.9.0-1.el8_4
thunderbird
Red Hat:rhel_eus_long_life:8.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_4
0:140.9.0-1.el8_4
thunderbird-debuginfo
Red Hat:rhel_eus_long_life:8.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_4
0:140.9.0-1.el8_4
thunderbird-debugsource
Red Hat:rhel_eus_long_life:8.4::appstream
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_4
0:140.9.0-1.el8_4
thunderbird
Rocky Linux:9
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el9_7
0:140.9.0-1.el9_7
thunderbird
Rocky Linux:10
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el10_1
0:140.9.0-1.el10_1
thunderbird
Rocky Linux:8
From an advisory covering 39 CVEs
 before 0:140.9.0-1.el8_10
0:140.9.0-1.el8_10
MozillaThunderbird
openSUSE:Leap 15.6
From an advisory covering 40 CVEs
 before 140.9.0-150200.8.263.1
140.9.0-150200.8.263.1
mozjs52
Ubuntu:18.04:LTS
 All versions, plus listed versions
52.3.1-0ubuntu352.3.1-7fakesync152.8.1-0ubuntu0.18.04.152.9.1-0ubuntu0.18.04.1
 None known
mozjs38
Ubuntu:18.04:LTS
 All versions, plus listed versions
38.8.0~repack1-0ubuntu138.8.0~repack1-0ubuntu338.8.0~repack1-0ubuntu4
 None known
mozjs68
Ubuntu:20.04:LTS
 All versions, plus listed versions
68.5.0-1~fakesync68.5.0-2~fakesync68.6.0-168.6.0-1ubuntu1
 None known
mozjs52
Ubuntu:20.04:LTS
 All versions, plus listed versions
52.9.1-1build152.9.1-1ubuntu3
 None known
mozjs102
Ubuntu:22.04:LTS
 All versions, plus listed versions
102.11.0-0ubuntu0.22.04.1102.12.0-0ubuntu0.22.04.1102.13.0-0ubuntu0.22.04.1102.15.1-0ubuntu0.22.04.1
 None known
mozjs78
Ubuntu:22.04:LTS
 All versions, plus listed versions
78.13.0-178.15.0-278.15.0-4ubuntu1
 None known
mozjs91
Ubuntu:22.04:LTS
 All versions, plus listed versions
91.5.1-0ubuntu191.6.0-191.6.0-291.7.0-291.10.0-0ubuntu1
 None known
thunderbird
Ubuntu:22.04:LTS
 All versions, plus listed versions
1:91.1.2+build1-0ubuntu11:91.3.0+build2-0ubuntu11:91.3.1+build1-0ubuntu11:91.3.2+build1-0ubuntu11:91.4.0+build1.1-0ubuntu1
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1:91.4.0+build2-0ubuntu11:91.5.0+build1-0ubuntu11:91.5.1+build1-0ubuntu11:91.6.1+build1-0ubuntu11:91.7.0+build1-0ubuntu11:91.7.0+build2-0ubuntu11:91.8.0+build2-0ubuntu11:91.9.1+build1-0ubuntu0.22.04.11:91.11.0+build2-0ubuntu0.22.04.11:102.2.2+build1-0ubuntu0.22.04.11:102.4.2+build2-0ubuntu0.22.04.11:102.7.1+build2-0ubuntu0.22.04.11:102.8.0+build2-0ubuntu0.22.04.11:102.9.0+build1-0ubuntu0.22.04.11:102.10.0+build2-0ubuntu0.22.04.11:102.11.0+build1-0ubuntu0.22.04.11:102.13.0+build1-0ubuntu0.22.04.11:102.15.0+build1-0ubuntu0.22.04.11:102.15.1+build1-0ubuntu0.22.04.11:115.3.1+build1-0ubuntu0.22.04.21:115.4.1+build1-0ubuntu0.22.04.11:115.5.0+build1-0ubuntu0.22.04.11:115.6.0+build2-0ubuntu0.22.04.11:115.8.1+build1-0ubuntu0.22.04.11:115.9.0+build1-0ubuntu0.22.04.11:115.10.1+build1-0ubuntu0.22.04.11:115.11.0+build2-0ubuntu0.22.04.11:115.12.0+build3-0ubuntu0.22.04.11:115.13.0+build5-0ubuntu0.22.04.11:115.15.0+build1-0ubuntu0.22.04.11:115.16.0+build2-0ubuntu0.22.04.11:115.18.0+build1-0ubuntu0.22.04.11:128.12.0+build1-0ubuntu0.22.04.11:140.7.1+build1-0ubuntu0.22.04.1
 None known
mozjs102
Ubuntu:24.04:LTS
 All versions, plus listed versions
102.15.1-1102.15.1-3ubuntu2
 None known
mozjs115
Ubuntu:24.04:LTS
 All versions, plus listed versions
115.3.0-0ubuntu1115.4.0-2115.5.0-1115.6.0-1115.7.0-4
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115.8.0-1115.9.0-1115.9.0-1build1115.10.0-1
 None known
MozillaThunderbird
openSUSE:Tumbleweed
From an advisory covering 40 CVEs
 before 140.9.0-1.1
140.9.0-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-4371 is a high vulnerability (CVSS 7.4) in Mozilla Thunderbird, published March 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 31st percentile. Fixed in thunderbird 1:140.9.0esr-1~deb12u1.

References

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This page doesn't list everything

Left out here: 538 versions, 358 references and the rest of 10 source descriptions. The JSON record has them.

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