Mozilla Thunderbird (en-US) 157.0
Mozilla Thunderbird (en-US) 157.0, released September 30, 2026, fixes 76 CVEs in Mozilla Thunderbird (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 76 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird (en-US) | 157.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-100788 | Invalid pointer in the JavaScript: WebAssembly component | 9.8 | 0.0042 | None reported |
| Urgent | CVE-2026-100810 | Other issue in the DevTools component | 9.8 | 0.0038 | None reported |
| Urgent | CVE-2026-100763 | Incorrect boundary conditions in the Graphics: WebGPU component | 9.1 | 0.0038 | None reported |
| Urgent | CVE-2026-100775 | Sandbox escape in the Graphics component | 9.6 | 0.0033 | None reported |
| Urgent | CVE-2026-100781 | Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component | 9.6 | 0.0033 | None reported |
| Urgent | CVE-2026-100794 | Sandbox escape due to incorrect boundary conditions in the Internationalization component | 9.6 | 0.0032 | None reported |
| Urgent | CVE-2026-100762 | Sandbox escape due to use-after-free in the DOM: Content Processes component | 9.6 | 0.0032 | None reported |
| Urgent | CVE-2026-100770 | Sandbox escape due to use-after-free in the DOM: Content Processes component | 9.6 | 0.0032 | None reported |
| Urgent | CVE-2026-100778 | Sandbox escape due to use-after-free in the DOM: Core & HTML component | 9.6 | 0.0032 | None reported |
| Urgent | CVE-2026-100786 | Sandbox escape due to use-after-free in the Graphics component | 9.6 | 0.0032 | None reported |
| Urgent | CVE-2026-100758 | Sandbox escape in the DOM: Navigation component | 9.6 | 0.0030 | None reported |
| Urgent | CVE-2026-100760 | Sandbox escape in the Security: Process Sandboxing component | 9.6 | 0.0030 | None reported |
| Urgent | CVE-2026-100787 | Sandbox escape in the XUL component | 9.6 | 0.0030 | None reported |
| Urgent | CVE-2026-100800 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.6 | 0.0029 | None reported |
| Urgent | CVE-2026-100804 | Sandbox escape due to use-after-free in the Preferences: Backend component | 9.6 | 0.0028 | None reported |
| Urgent | CVE-2026-100811 | Sandbox escape due to use-after-free in the DOM: Core & HTML component | 9.6 | 0.0027 | None reported |
| Urgent | CVE-2026-100818 | Sandbox escape due to use-after-free in the Widget: Gtk component | 9.6 | 0.0027 | None reported |
| Urgent | CVE-2026-100819 | Sandbox escape due to incorrect boundary conditions in the XPCOM component | 9.6 | 0.0026 | None reported |
| Urgent | CVE-2026-100828 | Mitigation bypass in the Bookmarks & History component | 9.6 | 0.0024 | None reported |
| Urgent | CVE-2026-100829 | Mitigation bypass in the DOM: Security component | 9.6 | 0.0024 | None reported |
| High | CVE-2026-100773 | Use-after-free in the Storage: IndexedDB component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-100791 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-100783 | Uninitialized memory in the Audio/Video component | 7.5 | 0.0035 | None reported |
| High | CVE-2026-100767 | Use-after-free in the Networking: Cache component | 8.8 | 0.0033 | None reported |
| High | CVE-2026-100779 | Use-after-free in the XSLT component | 8.8 | 0.0033 | None reported |
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