Every CVE Search/ Get API key

CVE-2026-8949

Integer overflow in the Widget: Win32 component

7.5 High

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.58%Up 0.5 points since May 20, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

Integer overflow in the Widget: Win32 component

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Record
CVE-2026-8949
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
EUVDEUVD-2026-30899 7.5

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Record
EUVD-2026-30899
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-wpxg-v53p-m79m 7.5

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and...

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.

Record
GHSA-wpxg-v53p-m79m
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
NVD 7.5

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Record
CVE-2026-8949
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
OSVOESA-2026-2392 9.8

firefox security update

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo

Security Fix(es):

A critical vulnerability has been discovered in Mozilla Firefox browser versions up to 150.0.2, classified as CWE-119 buffer error. The vulnerability allows the product to read from or write to memory locations outside the intended boundary of the buffer when performing operations on a memory buffer. This vulnerability affects confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8388)

A vulnerability was found in Mozilla Firefox up to 150.0.2 (Web Browser). It has been declared as critical. As an impact it is known to affect confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8391)

A sandbox escape vulnerability exists in the Profile Backup component of Mozilla Firefox. This vulnerability affects Firefox versions up to 150.0.2 and was fixed in version 150.0.3. An attacker could potentially exploit this vulnerability to bypass sandbox protections, impacting the confidentiality, integrity, and availability of the system.(CVE-2026-8401)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8946)

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8947)

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8949)

Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8950)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8953)

Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8954)

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8955)

Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8956)

Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8957)

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8958)

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8959)

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8961)

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8962)

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8968)

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8970) …

Record
OESA-2026-2392
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
OSVOESA-2026-2393 9.8

firefox security update

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo

Security Fix(es):

A critical vulnerability has been discovered in Mozilla Firefox browser versions up to 150.0.2, classified as CWE-119 buffer error. The vulnerability allows the product to read from or write to memory locations outside the intended boundary of the buffer when performing operations on a memory buffer. This vulnerability affects confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8388)

A vulnerability was found in Mozilla Firefox up to 150.0.2 (Web Browser). It has been declared as critical. As an impact it is known to affect confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8391)

A sandbox escape vulnerability exists in the Profile Backup component of Mozilla Firefox. This vulnerability affects Firefox versions up to 150.0.2 and was fixed in version 150.0.3. An attacker could potentially exploit this vulnerability to bypass sandbox protections, impacting the confidentiality, integrity, and availability of the system.(CVE-2026-8401)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8946)

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8947)

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8949)

Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8950)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8953)

Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8954)

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8955)

Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8956)

Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8957)

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8958)

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8959)

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8961)

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8962)

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8968)

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8970) …

Record
OESA-2026-2393
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 13 moreShow less
OSVOESA-2026-2394 9.8

firefox security update

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo

Security Fix(es):

A critical vulnerability has been discovered in Mozilla Firefox browser versions up to 150.0.2, classified as CWE-119 buffer error. The vulnerability allows the product to read from or write to memory locations outside the intended boundary of the buffer when performing operations on a memory buffer. This vulnerability affects confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8388)

A vulnerability was found in Mozilla Firefox up to 150.0.2 (Web Browser). It has been declared as critical. As an impact it is known to affect confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8391)

A sandbox escape vulnerability exists in the Profile Backup component of Mozilla Firefox. This vulnerability affects Firefox versions up to 150.0.2 and was fixed in version 150.0.3. An attacker could potentially exploit this vulnerability to bypass sandbox protections, impacting the confidentiality, integrity, and availability of the system.(CVE-2026-8401)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8946)

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8947)

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8949)

Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8950)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8953)

Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8954)

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8955)

Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8956)

Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8957)

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8958)

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8959)

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8961)

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8962)

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8968)

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8970) …

Record
OESA-2026-2394
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
OSVOESA-2026-2465 9.8

firefox security update

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo

Security Fix(es):

A critical vulnerability has been discovered in Mozilla Firefox browser versions up to 150.0.2, classified as CWE-119 buffer error. The vulnerability allows the product to read from or write to memory locations outside the intended boundary of the buffer when performing operations on a memory buffer. This vulnerability affects confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8388)

A vulnerability was found in Mozilla Firefox up to 150.0.2 (Web Browser). It has been declared as critical. As an impact it is known to affect confidentiality, integrity, and availability. Upgrading to version 150.0.3 eliminates this vulnerability.(CVE-2026-8391)

A sandbox escape vulnerability exists in the Profile Backup component of Mozilla Firefox. This vulnerability affects Firefox versions up to 150.0.2 and was fixed in version 150.0.3. An attacker could potentially exploit this vulnerability to bypass sandbox protections, impacting the confidentiality, integrity, and availability of the system.(CVE-2026-8401)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8946)

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8947)

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8949)

Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8950)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.(CVE-2026-8953)

Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8954)

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8955)

Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8956)

Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8957)

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8958)

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8959)

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8961)

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.(CVE-2026-8962)

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8968)

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.(CVE-2026-8970) …

Record
OESA-2026-2465
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
OSVOESA-2026-2756 9.8

thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12289)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12290)

Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12291)

Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12292)

Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12294)

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12295)

Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12296)

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12297)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12298)

JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12299)

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12302)

Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12304)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12305)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12306)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12307)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12308)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12309)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12310)

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12311)

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12312)

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.(CVE-2026-12313)

Memory safety bug fixed in Firefox 152. This vulnerability was…

Record
OESA-2026-2756
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-2026-8949 7.5

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Record
UBUNTU-CVE-2026-8949
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:10813-1 No score

firefox-esr-140.11.0-1.1 on GA media

These are all security issues fixed in the firefox-esr-140.11.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10813-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:10863-1 No score

MozillaFirefox-151.0.1-1.1 on GA media

These are all security issues fixed in the MozillaFirefox-151.0.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10863-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:10864-1 No score

MozillaThunderbird-140.11.1-1.1 on GA media

These are all security issues fixed in the MozillaThunderbird-140.11.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10864-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20789-1 No score

Security update for MozillaFirefox

This update for MozillaFirefox fixes the following issues

  • Update to Firefox Extended Support Release 140.11.0 ESR MFSA 2026-48 (bsc#1265212).

MFSA 2026-48:

  • CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component.
  • CVE-2026-8391: Other issue in the JavaScript Engine component.
  • CVE-2026-8401: Sandbox escape in the Profile Backup component.
  • CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs component.
  • CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component.
  • CVE-2026-8949: Integer overflow in the Widget: Win32 component.
  • CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component.
  • CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component.
  • CVE-2026-8954: Incorrect boundary conditions, integer overflow in the Audio/Video component.
  • CVE-2026-8955: Privilege escalation in the DOM: Workers component.
  • CVE-2026-8956: Integer overflow in the Networking: JAR component.
  • CVE-2026-8957: Privilege escalation in the Enterprise Policies component.
  • CVE-2026-8958: Information disclosure, sandbox escape in the Security: Process Sandboxing component.
  • CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
  • CVE-2026-8961: Spoofing issue in the Form Autofill component.
  • CVE-2026-8962: Mitigation bypass in the DOM: Security component.
  • CVE-2026-8968: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component.
  • CVE-2026-8970: Privilege escalation in the Security component.
  • CVE-2026-8974: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151.
  • CVE-2026-8975: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151.
Record
openSUSE-SU-2026:20789-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21168-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

Changes in MozillaThunderbird:

  • Mozilla Thunderbird 140.12.0 ESR MFSA 2026-61 (bsc#1268071)

    • CVE-2026-12289 (bmo#2023443) Privilege escalation in the Graphics: WebRender component
    • CVE-2026-12290 (bmo#2024852) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12291 (bmo#2036929) Use-after-free in the Networking: HTTP component
    • CVE-2026-12292 (bmo#2038465) Incorrect boundary conditions in the Web Audio component
    • CVE-2026-12294 (bmo#2039873) Sandbox escape in the DOM: Workers component
    • CVE-2026-12295 (bmo#2040160) Sandbox escape in the DOM: Navigation component
    • CVE-2026-12298 (bmo#2041981) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12296 (bmo#2040515) Sandbox escape in the Security: Process Sandboxing component
    • CVE-2026-12297 (bmo#2041610) Sandbox escape due to incorrect boundary conditions in the Networking component
    • CVE-2026-12299 (bmo#2043139) JIT miscompilation in the DOM: Core & HTML component
    • CVE-2026-12329 (bmo#2044738) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12302 (bmo#2034489) Mitigation bypass in the DOM: Security component
    • CVE-2026-12304 (bmo#2034944) Same-origin policy bypass in the Networking: Cookies component
    • CVE-2026-12305 (bmo#2037290) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12306 (bmo#2037323) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12307 (bmo#2038133) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12308 (bmo#2038302) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12309 (bmo#2038476) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12310 (bmo#2039707) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12311 (bmo#2040177) Information disclosure, sandbox escape in the Security: Process Sandboxing component
    • CVE-2026-12312 (bmo#2040383) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12313 (bmo#2040477) Information disclosure, sandbox escape in the Security: Process Sandboxing component
    • CVE-2026-12314 (bmo#2041856) Memory safety bug fixed in Thunderbird ESR 140.12
    • CVE-2026-12315 (bmo#2042058) Mitigation bypass in the DOM: Security component
    • CVE-2026-12330 (bmo#2029326) Incorrect boundary conditions in the Internationalization component
    • CVE-2026-12324 (bmo#2038444) Incorrect boundary conditions in the Graphics: CanvasWebGL component
    • CVE-2026-12325 (bmo#2039443) Denial-of-service in the Graphics: ImageLib component
    • CVE-2026-12327 (bmo#2011842, bmo#2023902, bmo#2025512, bmo#2027312, bmo#2029444, bmo#2036571, bmo#2036900, bmo#2036936, bmo#2037995, bmo#2038551, bmo#2040717, bmo#2042724) Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152
    • CVE-2026-12328 (bmo#2029402, bmo#2038477, bmo#2039726, bmo#2041373, bmo#2042268, bmo#2042451, bmo#2042782, bmo#2042858, bmo#2042929, bmo#2042965, bmo#2043213) Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152

  • Mozilla Thunderbird 140.11.0 ESR MFSA 2026-51 (bsc#1265212)

    • CVE-2026-8946 (bmo#2029070) Incorrect boundary conditions in the Audio/Video: Web Codecs component
    • CVE-2026-8388 (bmo#2036978) Incorrect boundary conditions in the JavaScript Engine: JIT component
    • CVE-2026-8947 (bmo#2038439) Use-after-free in the DOM: Bindings (WebIDL) component
    • CVE-2026-8391 (bmo#2038575) Other issue in the JavaScript Engine component
    • CVE-2026-8401 (bmo#2038679) Sandbox escape in the Profile Backup component
    • CVE-2026-8949 (bmo#1355639) Integer overflow in the Widget: Win32 component
    • CVE-2026-8950 (bmo#1965430) Same-origin policy bypass in the…
Record
openSUSE-SU-2026:21168-1
Updated
2026-11-02
OSVSUSE-SU-2026:2039-1 No score

Security update for MozillaFirefox

This update for MozillaFirefox fixes the following issue

Update to Firefox Extended Support Release 140.11.0 ESR MFSA 2026-48 (bsc#1265212)

  • CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component.
  • CVE-2026-8391: Other issue in the JavaScript Engine component.
  • CVE-2026-8401: Sandbox escape in the Profile Backup component.
  • CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs component.
  • CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component.
  • CVE-2026-8949: Integer overflow in the Widget: Win32 component.
  • CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component.
  • CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component.
  • CVE-2026-8954: Incorrect boundary conditions, integer overflow in the Audio/Video component.
  • CVE-2026-8955: Privilege escalation in the DOM: Workers component.
  • CVE-2026-8956: Integer overflow in the Networking: JAR component.
  • CVE-2026-8957: Privilege escalation in the Enterprise Policies component.
  • CVE-2026-8958: Information disclosure, sandbox escape in the Security: Process Sandboxing component.
  • CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
  • CVE-2026-8961: Spoofing issue in the Form Autofill component.
  • CVE-2026-8962: Mitigation bypass in the DOM: Security component.
  • CVE-2026-8968: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component.
  • CVE-2026-8970: Privilege escalation in the Security component.
  • CVE-2026-8974: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151.
  • CVE-2026-8975: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151.
Record
SUSE-SU-2026:2039-1
Updated
2026-11-02
OSVSUSE-SU-2026:2109-1 No score

Security update for MozillaFirefox

This update for MozillaFirefox fixes the following issues

Update to Firefox Extended Support Release 140.11.0 ESR MFSA 2026-41, MFSA 2026-48 (bsc#1265212, bsc#1264378):

  • CVE-2026-8090: Use-after-free in the DOM: Networking component.
  • CVE-2026-8092: Memory safety bugs fixed in Firefox ESR 115.35.2, Firefox ESR 140.10.2 and Firefox 150.0.2.
  • CVE-2026-8094: Other issue in the WebRTC component.
  • CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component.
  • CVE-2026-8391: Other issue in the JavaScript Engine component.
  • CVE-2026-8401: Sandbox escape in the Profile Backup component.
  • CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs component.
  • CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component.
  • CVE-2026-8949: Integer overflow in the Widget: Win32 component.
  • CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component.
  • CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component.
  • CVE-2026-8954: Incorrect boundary conditions, integer overflow in the Audio/Video component.
  • CVE-2026-8955: Privilege escalation in the DOM: Workers component.
  • CVE-2026-8956: Integer overflow in the Networking: JAR component.
  • CVE-2026-8957: Privilege escalation in the Enterprise Policies component.
  • CVE-2026-8958: Information disclosure, sandbox escape in the Security: Process Sandboxing component.
  • CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
  • CVE-2026-8961: Spoofing issue in the Form Autofill component.
  • CVE-2026-8962: Mitigation bypass in the DOM: Security component.
  • CVE-2026-8968: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component.
  • CVE-2026-8970: Privilege escalation in the Security component.
  • CVE-2026-8974: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151.
  • CVE-2026-8975: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151.
Record
SUSE-SU-2026:2109-1
Updated
2026-11-02
OSVSUSE-SU-2026:21828-1 No score

Security update for MozillaFirefox

This update for MozillaFirefox fixes the following issues

  • Update to Firefox Extended Support Release 140.11.0 ESR MFSA 2026-48 (bsc#1265212).

MFSA 2026-48:

  • CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component.
  • CVE-2026-8391: Other issue in the JavaScript Engine component.
  • CVE-2026-8401: Sandbox escape in the Profile Backup component.
  • CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs component.
  • CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component.
  • CVE-2026-8949: Integer overflow in the Widget: Win32 component.
  • CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component.
  • CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component.
  • CVE-2026-8954: Incorrect boundary conditions, integer overflow in the Audio/Video component.
  • CVE-2026-8955: Privilege escalation in the DOM: Workers component.
  • CVE-2026-8956: Integer overflow in the Networking: JAR component.
  • CVE-2026-8957: Privilege escalation in the Enterprise Policies component.
  • CVE-2026-8958: Information disclosure, sandbox escape in the Security: Process Sandboxing component.
  • CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
  • CVE-2026-8961: Spoofing issue in the Form Autofill component.
  • CVE-2026-8962: Mitigation bypass in the DOM: Security component.
  • CVE-2026-8968: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component.
  • CVE-2026-8970: Privilege escalation in the Security component.
  • CVE-2026-8974: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151.
  • CVE-2026-8975: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151.
Record
SUSE-SU-2026:21828-1
Updated
2026-11-02
OSVSUSE-SU-2026:2271-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues

  • Updated to Mozilla Thunderbird 140.11 (bsc#1265212)

MFSA 2026-44:

  • CVE-2026-8090: Use-after-free in the DOM: Networking component.
  • CVE-2026-8092: Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thunderbird 150.0.2.
  • CVE-2026-8094: Other issue in the WebRTC component.

MFSA 2026-51:

  • CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component.
  • CVE-2026-8391: Other issue in the JavaScript Engine component.
  • CVE-2026-8401: Sandbox escape in the Profile Backup component.
  • CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs component.
  • CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component.
  • CVE-2026-8949: Integer overflow in the Widget: Win32 component.
  • CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component.
  • CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component.
  • CVE-2026-8954: Incorrect boundary conditions, integer overflow in the Audio/Video component.
  • CVE-2026-8955: Privilege escalation in the DOM: Workers component.
  • CVE-2026-8956: Integer overflow in the Networking: JAR component.
  • CVE-2026-8957: Privilege escalation in the Enterprise Policies component.
  • CVE-2026-8958: Information disclosure, sandbox escape in the Security: Process Sandboxing component.
  • CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
  • CVE-2026-8961: Spoofing issue in the Form Autofill component.
  • CVE-2026-8962: Mitigation bypass in the DOM: Security component.
  • CVE-2026-8968: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component.
  • CVE-2026-8970: Privilege escalation in the Security component.
  • CVE-2026-8974: Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151.
  • CVE-2026-8975: Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151.
Record
SUSE-SU-2026:2271-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
firefox
openEuler:24.03-LTS-SP3
From an advisory covering 20 CVEs
 before 140.11.0-1.oe2403sp3
140.11.0-1.oe2403sp3
firefox
openEuler:22.03-LTS-SP4
From an advisory covering 20 CVEs
 before 140.11.0-1.oe2203sp4
140.11.0-1.oe2203sp4
firefox
openEuler:24.03-LTS
From an advisory covering 20 CVEs
 before 140.11.0-1.oe2403
140.11.0-1.oe2403
firefox
openEuler:24.03-LTS-SP1
From an advisory covering 20 CVEs
 before 140.11.0-1.oe2403sp1
140.11.0-1.oe2403sp1
thunderbird
openEuler:24.03-LTS-SP3
From an advisory covering 49 CVEs
 before 140.12.0-1.oe2403sp3
140.12.0-1.oe2403sp3
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
Show 9 moreShow less
Affected packages
PackageAffectedFixed
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
Show 34 moreShow less
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
Show 4 moreShow less
115.8.0-1115.9.0-1115.9.0-1build1115.10.0-1
 None known
firefox-esr
openSUSE:Tumbleweed
From an advisory covering 20 CVEs
 before 140.11.0-1.1
140.11.0-1.1
MozillaFirefox
openSUSE:Tumbleweed
From an advisory covering 31 CVEs
 before 151.0.1-1.1
151.0.1-1.1
MozillaThunderbird
openSUSE:Tumbleweed
From an advisory covering 20 CVEs
 before 140.11.1-1.1
140.11.1-1.1
MozillaThunderbird
openSUSE:Leap 16.0
From an advisory covering 56 CVEs
 before 140.12.0-bp160.1.1
140.12.0-bp160.1.1

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-2026-8949 is a high vulnerability (CVSS 7.5) in Mozilla Firefox, published May 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.58%, the 48th percentile. No source names a fixed version.

References

Show 139 moreShow less
This page doesn't list everything

Left out here: the rest of 6 source descriptions. The JSON record has them.

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open