PatchFirst · Latest vulnerabilities

thunderbird vulnerabilities · Page 13

Vulnerabilities published for thunderbird in the last 30 days: 278. Listed in the KEV catalogue: 0.

RSS ↗ JSON ↗

Vulnerabilities: 1344

CVE-2026-100800
Critical · CVSS 9.6EPSS 0.29%Fix available
Sandbox escape due to use-after-free in the Disability Access APIs component
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100798
High · CVSS 8.1EPSS 0.19%Fix available
Cryptography misuse in Storage: Quota Manager component
Cryptography misuse in Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated October 1, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100797
High · CVSS 8.8EPSS 0.25%Fix available
Privilege escalation due to use-after-free in the Graphics: WebRender component
Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-96869
Medium · CVSS 4.3EPSS 0.24%Fix available
Information disclosure in the Networking component
Information disclosure in the Networking component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100794
Critical · CVSS 9.6EPSS 0.32%Fix available
Sandbox escape due to incorrect boundary conditions in the Internationalization component
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated October 1, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100792
High · CVSS 7.1EPSS 0.26%Fix available
JIT miscompilation in the JavaScript: WebAssembly component
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated October 1, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100791
High · CVSS 8.8EPSS 0.4%Fix available
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100790
High · CVSS 8.8EPSS 0.32%Fix available
Use-after-free in the XSLT component
Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100789
High · CVSS 8.8EPSS 0.32%Fix available
Use-after-free in the Graphics: Canvas2D component
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100788
Critical · CVSS 9.8EPSS 0.41%Fix available
Invalid pointer in the JavaScript: WebAssembly component
Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated October 1, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100787
Critical · CVSS 9.6EPSS 0.3%Fix available
Sandbox escape in the XUL component
Sandbox escape in the XUL component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated October 1, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100786
Critical · CVSS 9.6EPSS 0.32%Fix available
Sandbox escape due to use-after-free in the Graphics component
Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100785
High · CVSS 8.8EPSS 0.32%Fix available
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100784
High · CVSS 8.8EPSS 0.33%Fix available
Use-after-free in the Layout: Text and Fonts component
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100783
Medium · CVSS 4.3EPSS 0.35%Fix available
Uninitialized memory in the Audio/Video component
Uninitialized memory in the Audio/Video component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100782
High · CVSS 8.8EPSS 0.26%Fix available
Privilege escalation due to incorrect boundary conditions in the Graphics component
Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100781
Critical · CVSS 9.6EPSS 0.33%Fix available
Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component
Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated October 1, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100780
High · CVSS 8.8EPSS 0.32%Fix available
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100779
High · CVSS 8.8EPSS 0.33%Fix available
Use-after-free in the XSLT component
Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗
CVE-2026-100778
Critical · CVSS 9.6EPSS 0.32%Fix available
Sandbox escape due to use-after-free in the DOM: Core & HTML component
Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
thunderbird Operating systems
- Update to 1:153.4.0esr-1
Published September 29, 2026Updated September 30, 2026
Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

Check your server

Check your installed stack and versions against the current vulnerability feeds.

Check your server →

thunderbird vulnerabilities · Page 13

Sandbox escape due to use-after-free in the Disability Access APIs component

Cryptography misuse in Storage: Quota Manager component

Privilege escalation due to use-after-free in the Graphics: WebRender component

Information disclosure in the Networking component

Sandbox escape due to incorrect boundary conditions in the Internationalization component

JIT miscompilation in the JavaScript: WebAssembly component

Use-after-free in the DOM: Core & HTML component

Use-after-free in the XSLT component

Use-after-free in the Graphics: Canvas2D component

Invalid pointer in the JavaScript: WebAssembly component

Sandbox escape in the XUL component

Sandbox escape due to use-after-free in the Graphics component

Use-after-free in the DOM: Core & HTML component

Use-after-free in the Layout: Text and Fonts component

Uninitialized memory in the Audio/Video component

Privilege escalation due to incorrect boundary conditions in the Graphics component

Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component

Use-after-free in the DOM: Core & HTML component

Use-after-free in the XSLT component

Sandbox escape due to use-after-free in the DOM: Core & HTML component

Check your server