Mozilla Thunderbird (rm) 157.0
Mozilla Thunderbird (rm) 157.0, released September 30, 2026, fixes 76 CVEs in Mozilla Thunderbird (rm). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (rm) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (rm) 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 (rm) | 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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