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CVE-2026-103500

Heap buffer overflow opening large email

6.1 MediumFix available

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
High

Exploit likelihood

0.28%Up 0.1 points since Oct 1, 2026
90%50%10%1%

What each source reports

NVD Score used 6.1

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Record
CVE-2026-103500
CVSS 3.1
6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CVSS 3.1
6.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-787, CWE-122
Updated
2026-11-02
CVE List 6.3

Heap buffer overflow opening large email

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Record
CVE-2026-103500
CVSS 3.1
6.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-122
Updated
2026-11-02
EUVDEUVD-2026-90200 6.3

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Record
EUVD-2026-90200
CVSS 3.1
6.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-vjxp-5j85-5rqg 6.1

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater...

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Record
GHSA-vjxp-5j85-5rqg
CVSS 3.1
6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Weakness
CWE-122, CWE-787
Updated
2026-11-02
OSVDEBIAN-CVE-2026-103500 6.1

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Record
DEBIAN-CVE-2026-103500
CVSS 3.1
6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Updated
2026-11-02
OSVOESA-2026-4457 9.8

thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.(CVE-2026-103500)

Record
OESA-2026-4457
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVOESA-2026-4458 9.8

thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.(CVE-2026-103500)

Record
OESA-2026-4458
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-103500 6.1

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Record
UBUNTU-CVE-2026-103500
CVSS 3.1
6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CVSS 3.1
6.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVCLSA-2026-1792779937 No score

thunderbird: Fix of 56 CVEs

  • update to 153.5.0 ESR (MFSA 2026-103 for 153.4, MFSA 2026-110 for 153.5)
  • drop CVE-2026-100779-CVE-2026-100785.patch and CVE-2026-100781.patch, their fixes are part of 153.5.0
  • stop packaging rnp-cli and rnpkeys: upstream no longer installs them (bug 2068130); librnp.so is still shipped
  • regenerate langpacks from the 153.5.0esr release xpi set (66 languages, the same set as 153.3.1esr)
  • CVE-2026-103500: Heap buffer overflow opening large email
  • CVE-2026-100756: Incorrect boundary conditions in the Audio/Video: Playback component
  • CVE-2026-100757: Use-after-free in the Widget component
  • CVE-2026-100758: Sandbox escape in the DOM: Navigation component
  • CVE-2026-100759: Uninitialized memory in the Storage: Quota Manager component
  • CVE-2026-100760: Sandbox escape in the Security: Process Sandboxing component
  • CVE-2026-100762: Sandbox escape due to use-after-free in the DOM: Content Processes component
  • CVE-2026-100765: Use-after-free in the JavaScript: WebAssembly component
  • CVE-2026-100766: Information disclosure in the Networking: JAR component
  • CVE-2026-100767: Use-after-free in the Networking: Cache component
  • CVE-2026-100769: Use-after-free in the JavaScript: WebAssembly component
  • CVE-2026-100770: Sandbox escape due to use-after-free in the DOM: Content Processes component
  • CVE-2026-100771: Undefined behavior in the DOM: Streams component
  • CVE-2026-100772: Use-after-free in the DOM: Core & HTML component
  • CVE-2026-100773: Use-after-free in the Storage: IndexedDB component
  • CVE-2026-100774: Use-after-free in the DOM: Core & HTML component
  • CVE-2026-100775: Sandbox escape in the Graphics component
  • CVE-2026-100776: Use-after-free in the JavaScript: WebAssembly component
  • CVE-2026-100777: Use-after-free in the Graphics: Canvas2D component
  • CVE-2026-100778: Sandbox escape due to use-after-free in the DOM: Core & HTML component
  • CVE-2026-100779: Use-after-free in the XSLT component
  • CVE-2026-100780: Use-after-free in the DOM: Core & HTML component
  • CVE-2026-100781: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component
  • CVE-2026-100782: Privilege escalation due to incorrect boundary conditions in the Graphics component
  • CVE-2026-100783: Uninitialized memory in the Audio/Video component
  • CVE-2026-100784: Use-after-free in the Layout: Text and Fonts component
  • CVE-2026-100785: Use-after-free in the DOM: Core & HTML component
  • CVE-2026-100786: Sandbox escape due to use-after-free in the Graphics component
  • CVE-2026-100787: Sandbox escape in the XUL component
  • CVE-2026-100788: Invalid pointer in the JavaScript: WebAssembly component
  • CVE-2026-100789: Use-after-free in the Graphics: Canvas2D component
  • CVE-2026-100790: Use-after-free in the XSLT component
  • CVE-2026-100791: Use-after-free in the DOM: Core & HTML component
  • CVE-2026-100832: Use-after-free in the Graphics: Canvas2D component
  • CVE-2026-100792: JIT miscompilation in the JavaScript: WebAssembly component
  • CVE-2026-100794: Sandbox escape due to incorrect boundary conditions in the Internationalization component
  • CVE-2026-96869: Information disclosure in the Networking component
  • CVE-2026-100797: Privilege escalation due to use-after-free in the Graphics: WebRender component
  • CVE-2026-100798: Cryptography misuse in Storage: Quota Manager component
  • CVE-2026-100800: Sandbox escape due to use-after-free in the Disability Access APIs component
  • CVE-2026-100801: Privilege escalation in the DLL Services component
  • CVE-2026-100803: Same-origin policy bypass in the WebExtensions component
  • CVE-2026-100806: Uninitialized memory in the Graphics: WebGPU component
  • CVE-2026-100807: Privilege escalation in the DOM: Service Workers component
  • CVE-2026-100808: Mitigation bypass in the DOM: Service Workers component
  • CVE-2026-100809: Same-origin policy bypass in the DevTools component
  • CVE-2026-100811: Sandbox escape due to use-after-free in the DOM: Core & HTML component
  • CVE-2026-100812:…
Record
CLSA-2026-1792779937
Updated
2026-11-02
OSVMGASA-2026-0492 No score

Updated thunderbird packages fix security vulnerabilities

Heap buffer overflow opening large email. (CVE-2026-103500) Incorrect boundary conditions in the Audio/Video: Playback component. (CVE-2026-100756) Use-after-free in the Widget component. (CVE-2026-100757) Sandbox escape in the DOM: Navigation component. (CVE-2026-100758) Uninitialized memory in the Storage: Quota Manager component. (CVE-2026-100759) Sandbox escape in the Security: Process Sandboxing component. (CVE-2026-100760) Sandbox escape due to use-after-free in the DOM: Content Processes component. (CVE-2026-100762) Use-after-free in the JavaScript: WebAssembly component. (CVE-2026-100765) Information disclosure in the Networking: JAR component. (CVE-2026-100766) Use-after-free in the Networking: Cache component. (CVE-2026-100767) Use-after-free in the JavaScript: WebAssembly component. (CVE-2026-100769) Sandbox escape due to use-after-free in the DOM: Content Processes component. (CVE-2026-100770) Undefined behavior in the DOM: Streams component. (CVE-2026-100771) Use-after-free in the DOM: Core & HTML component. (CVE-2026-100772) Use-after-free in the Storage: IndexedDB component. (CVE-2026-100773) Use-after-free in the DOM: Core & HTML component. (CVE-2026-100774) Sandbox escape in the Graphics component. (CVE-2026-100775) Use-after-free in the JavaScript: WebAssembly component. (CVE-2026-100776) Use-after-free in the Graphics: Canvas2D component. (CVE-2026-100777) Sandbox escape due to use-after-free in the DOM: Core & HTML component. (CVE-2026-100778) Use-after-free in the XSLT component. (CVE-2026-100779) Use-after-free in the DOM: Core & HTML component. (CVE-2026-100780) Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. (CVE-2026-100781) Privilege escalation due to incorrect boundary conditions in the Graphics component. (CVE-2026-100782) Uninitialized memory in the Audio/Video component. (CVE-2026-100783) Use-after-free in the Layout: Text and Fonts component. (CVE-2026-100784) Use-after-free in the DOM: Core & HTML component. (CVE-2026-100785) Sandbox escape due to use-after-free in the Graphics component. (CVE-2026-100786) Sandbox escape in the XUL component. (CVE-2026-100787) Invalid pointer in the JavaScript: WebAssembly component. (CVE-2026-100788) Use-after-free in the Graphics: Canvas2D component. (CVE-2026-100789) Use-after-free in the XSLT component. (CVE-2026-100790) Use-after-free in the DOM: Core & HTML component. (CVE-2026-100791) Use-after-free in the Graphics: Canvas2D component. (CVE-2026-100832) JIT miscompilation in the JavaScript: WebAssembly component. (CVE-2026-100792) Sandbox escape due to incorrect boundary conditions in the Internationalization component. (CVE-2026-100794) Information disclosure in the Networking component. (CVE-2026-96869) Privilege escalation due to use-after-free in the Graphics: WebRender component. (CVE-2026-100797) Cryptography misuse in Storage: Quota Manager component. (CVE-2026-100798) Sandbox escape due to use-after-free in the Disability Access APIs component. (CVE-2026-100800) Privilege escalation in the DLL Services component. (CVE-2026-100801) Same-origin policy bypass in the WebExtensions component. (CVE-2026-100803) Uninitialized memory in the Graphics: WebGPU component. (CVE-2026-100806) Privilege escalation in the DOM: Service Workers component. (CVE-2026-100807) Mitigation bypass in the DOM: Service Workers component. (CVE-2026-100808) Same-origin policy bypass in the DevTools component. (CVE-2026-100809) Sandbox escape due to use-after-free in the DOM: Core & HTML component. (CVE-2026-100811) Denial-of-service in the Graphics component. (CVE-2026-100812) Incorrect boundary conditions in the JavaScript Engine: JIT component. (CVE-2026-100814) Use-after-free in the CSS Parsing and Computation component. (CVE-2026-100815) Site isolation issue in the DOM: Networking component. (CVE-2026-100816) Sandbox escape due to use-after-free in the Widget: Gtk component. (CVE-2026-100818) Sandbox escape due to incorrect…

Record
MGASA-2026-0492
Updated
2026-11-02
OSVopenSUSE-SU-2026:12098-1 No score

MozillaThunderbird-153.4.0-1.1 on GA media

These are all security issues fixed in the MozillaThunderbird-153.4.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12098-1
Updated
2026-11-02
OSVSUSE-SU-2026:4627-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

Update to Mozilla Thunderbird 153.4 (MFSA 2026-96, MFSA 2026-103, bsc#1280371, bsc#1282929):

  • CVE-2026-92005: Use-after-free in the Audio/Video: Web Codecs component.
  • CVE-2026-92006: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92007: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92008: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92009: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92010: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92011: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92012: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92013: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
  • CVE-2026-92015: Privilege escalation in the WebExtensions component.
  • CVE-2026-92016: Use-after-free in the Disability Access APIs component.
  • CVE-2026-92017: Privilege escalation in the DOM: Service Workers component.
  • CVE-2026-92018: Sandbox escape in the DOM: Core & HTML component.
  • CVE-2026-92019: Mitigation bypass in the Remote Settings Client component.
  • CVE-2026-92020: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component.
  • CVE-2026-92022: Use-after-free in the DOM: HTML Parser component.
  • CVE-2026-92023: Use-after-free in the XML component.
  • CVE-2026-92024: Use-after-free in the SVG component.
  • CVE-2026-92025: Use-after-free in the DOM: Navigation component.
  • CVE-2026-92026: Use-after-free in the Networking component.
  • CVE-2026-92027: Use-after-free in the DOM: Streams component.
  • CVE-2026-92028: Use-after-free in the DOM: Core & HTML component.
  • CVE-2026-92029: Use-after-free in the SVG component.
  • CVE-2026-92030: Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component.
  • CVE-2026-92031: Information disclosure in the Graphics: ImageLib component.
  • CVE-2026-92032: Sandbox escape due to invalid pointer in the Graphics component.
  • CVE-2026-92035: Sandbox escape due to incorrect boundary conditions in the Graphics component.
  • CVE-2026-92038: Mitigation bypass in the Remote Settings Client component.
  • CVE-2026-92039: Mitigation bypass in the DOM: Notifications component.
  • CVE-2026-92041: Mitigation bypass in the DOM: Networking component.
  • CVE-2026-92042: Race condition in the DOM: Content Processes component.
  • CVE-2026-92043: Privilege escalation due to incorrect boundary conditions in the Audio/Video component.
  • CVE-2026-92044: Information disclosure in the Networking: HTTP component.
  • CVE-2026-92045: Sandbox escape due to incorrect boundary conditions in the WebRTC component.
  • CVE-2026-92046: Use-after-free in the Graphics component.
  • CVE-2026-92047: Privilege escalation in the Crash Reporting component.
  • CVE-2026-92048: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
  • CVE-2026-92049: Use-after-free in the Widget: Win32 component.
  • CVE-2026-92052: Privilege escalation due to uninitialized memory in the Graphics: CanvasWebGL component.
  • CVE-2026-92053: Privilege escalation in the Graphics: CanvasWebGL component.
  • CVE-2026-92054: Privilege escalation in the Memory component.
  • CVE-2026-92055: Privilege escalation in the DevTools component.
  • CVE-2026-92056: Use-after-free in the Graphics: Text component.
  • CVE-2026-92057: Mitigation bypass in the Enterprise Policies component.
  • CVE-2026-92058: Use-after-free in the Graphics component.
  • CVE-2026-92059: Incorrect boundary conditions in the DOM: Editor component.
  • CVE-2026-92060: Use-after-free in the…
Record
SUSE-SU-2026:4627-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
thunderbird
TuxCare:AlmaLinux:9.2
From an advisory covering 125 CVEs
 before 153.5.0-1.el9_2.alma.1.tuxcare.els1
153.5.0-1.el9_2.alma.1.tuxcare.els1
thunderbird
Debian:12
 before 1:140.17.0esr-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
Show 45 moreShow less
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
1:140.17.0esr-1~deb12u1
thunderbird
Debian:13
 before 1:140.17.0esr-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
Show 45 moreShow less
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-11:140.10.0esr-11:140.10.0esr-1~deb11u11:140.10.0esr-1~deb12u11:140.10.0esr-1~deb13u11:140.10.1esr-11:140.10.1esr-1~deb11u11:140.10.1esr-1~deb12u11:140.10.1esr-1~deb13u11:140.10.2esr-11:140.10.2esr-1~deb11u11:140.10.2esr-1~deb12u11:140.10.2esr-1~deb13u11:140.11.0esr-11:140.11.0esr-1~deb11u11:140.11.0esr-1~deb12u11:140.11.0esr-1~deb13u11:140.12.0esr-11:140.12.0esr-1~deb11u11:140.12.0esr-1~deb12u11:140.12.0esr-1~deb13u11:140.13.0esr-11:140.13.0esr-21:140.13.0esr-2~deb11u11:140.13.0esr-2~deb12u11:140.13.0esr-2~deb13u11:140.14.0esr-11:140.14.0esr-1~deb11u11:140.14.0esr-1~deb12u11:140.14.0esr-1~deb13u11:140.15.0esr-1~deb12u11:140.15.0esr-1~deb13u11:140.16.0esr-1~deb12u11:140.16.0esr-1~deb13u11:140.17.0esr-1~deb12u11:140.2.0esr-1
1:140.17.0esr-1~deb13u1
thunderbird
Debian:14
 before 1:153.4.0esr-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
Show 45 moreShow less
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-11:140.10.0esr-11:140.10.0esr-1~deb11u11:140.10.0esr-1~deb12u11:140.10.0esr-1~deb13u11:140.10.1esr-11:140.10.1esr-1~deb11u11:140.10.1esr-1~deb12u11:140.10.1esr-1~deb13u11:140.10.2esr-11:140.10.2esr-1~deb11u11:140.10.2esr-1~deb12u11:140.10.2esr-1~deb13u11:140.11.0esr-11:140.11.0esr-1~deb11u11:140.11.0esr-1~deb12u11:140.11.0esr-1~deb13u11:140.12.0esr-11:140.12.0esr-1~deb11u11:140.12.0esr-1~deb12u11:140.12.0esr-1~deb13u11:140.13.0esr-11:140.13.0esr-21:140.13.0esr-2~deb11u11:140.13.0esr-2~deb12u11:140.13.0esr-2~deb13u11:140.14.0esr-11:140.14.0esr-1~deb11u11:140.14.0esr-1~deb12u11:140.14.0esr-1~deb13u11:140.15.0esr-1~deb12u11:140.15.0esr-1~deb13u11:140.16.0esr-1~deb12u11:140.16.0esr-1~deb13u11:140.17.0esr-1~deb12u11:140.17.0esr-1~deb13u1
1:153.4.0esr-1
thunderbird-l10n
Mageia:10
From an advisory covering 63 CVEs
 before 153.4.0-1.mga10
153.4.0-1.mga10
thunderbird
Mageia:10
From an advisory covering 63 CVEs
 before 153.4.0-3.mga10
153.4.0-3.mga10
thunderbird
openEuler:24.03-LTS-SP3
 before 140.17.0-1.oe2403sp3
140.17.0-1.oe2403sp3
thunderbird
openEuler:24.03-LTS-SP4
 before 140.17.0-1.oe2403sp4
140.17.0-1.oe2403sp4
MozillaThunderbird
SUSE:Linux Enterprise Module for Package Hub 15 SP7
From an advisory covering 129 CVEs
 before 153.4.0-150400.13.6.1
153.4.0-150400.13.6.1
MozillaThunderbird
SUSE:Linux Enterprise Workstation Extension 15 SP7
From an advisory covering 129 CVEs
 before 153.4.0-150400.13.6.1
153.4.0-150400.13.6.1
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Affected packages
PackageAffectedFixed
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
thunderbird
Ubuntu:24.04:LTS
 All versions, plus listed versions
1:115.3.1+build1-0ubuntu11:115.4.1+build1-0ubuntu11:115.4.3+build1-0ubuntu11:115.5.0+build1-0ubuntu11:115.5.1+build1-0ubuntu1
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1:115.5.2+build2-0ubuntu11:115.6.0+build1-0ubuntu11:115.6.0+build2-0ubuntu11:115.6.1+build1-0ubuntu11:115.8.0+build1-0ubuntu11:115.8.1+build1+snap21:115.8.1+build1+snap32:1snap1-0ubuntu12:1snap1-0ubuntu3
 None known
thunderbird
Ubuntu:26.10
 All versions, plus listed versions
2:1snap1-0ubuntu5
 None known
thunderbird
Ubuntu:26.04:LTS
 All versions, plus listed versions
2:1snap1-0ubuntu32:1snap1-0ubuntu42:1snap1-0ubuntu5
 None known
MozillaThunderbird
openSUSE:Tumbleweed
From an advisory covering 138 CVEs
 before 153.4.0-1.1
153.4.0-1.1

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-2026-103500 is a medium vulnerability (CVSS 6.1) in Mozilla Thunderbird, published September 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in thunderbird 1:140.17.0esr-1~deb12u1.

References

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This page doesn't list everything

Left out here: 267 versions, 41 references and the rest of 3 source descriptions. The JSON record has them.

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