# Mozilla Thunderbird 157.0 Mozilla Thunderbird 157.0, released September 28, 2026, fixes 76 CVEs in Mozilla Thunderbird. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird is 159.0, which also fixes every one of these CVEs. - Web page: https://patchblox.com/security/fix/macos/org.mozilla.thunderbird-157.0 - Platform: macOS - Released: Sep 28, 2026 - Priority: Urgent (Closes CVE-2026-100788, rated Critical) - CVEs: 76, exploited: 0, on CISA KEV: 0 - Superseded by: [Mozilla Thunderbird 159.0](https://patchblox.com/security/data/product/macos/mozilla-thunderbird.md), the latest version, which also fixes every CVE listed here ## Applies to | Product | Release | Fixed in | |---|---|---| | [Mozilla Thunderbird](https://patchblox.com/security/data/product/macos/mozilla-thunderbird.md) | | 157.0 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-100788](https://patchblox.com/security/data/cve/CVE-2026-100788.md) | Urgent | Invalid pointer in the JavaScript: WebAssembly component | 9.8 | 0.0042 | | | [CVE-2026-100810](https://patchblox.com/security/data/cve/CVE-2026-100810.md) | Urgent | Other issue in the DevTools component | 9.8 | 0.0038 | | | [CVE-2026-100763](https://patchblox.com/security/data/cve/CVE-2026-100763.md) | Urgent | Incorrect boundary conditions in the Graphics: WebGPU component | 9.1 | 0.0038 | | | [CVE-2026-100775](https://patchblox.com/security/data/cve/CVE-2026-100775.md) | Urgent | Sandbox escape in the Graphics component | 9.6 | 0.0033 | | | [CVE-2026-100781](https://patchblox.com/security/data/cve/CVE-2026-100781.md) | Urgent | Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component | 9.6 | 0.0033 | | | [CVE-2026-100794](https://patchblox.com/security/data/cve/CVE-2026-100794.md) | Urgent | Sandbox escape due to incorrect boundary conditions in the Internationalization component | 9.6 | 0.0032 | | | [CVE-2026-100762](https://patchblox.com/security/data/cve/CVE-2026-100762.md) | Urgent | Sandbox escape due to use-after-free in the DOM: Content Processes component | 9.6 | 0.0032 | | | [CVE-2026-100770](https://patchblox.com/security/data/cve/CVE-2026-100770.md) | Urgent | Sandbox escape due to use-after-free in the DOM: Content Processes component | 9.6 | 0.0032 | | | [CVE-2026-100778](https://patchblox.com/security/data/cve/CVE-2026-100778.md) | Urgent | Sandbox escape due to use-after-free in the DOM: Core & HTML component | 9.6 | 0.0032 | | | [CVE-2026-100786](https://patchblox.com/security/data/cve/CVE-2026-100786.md) | Urgent | Sandbox escape due to use-after-free in the Graphics component | 9.6 | 0.0032 | | | [CVE-2026-100758](https://patchblox.com/security/data/cve/CVE-2026-100758.md) | Urgent | Sandbox escape in the DOM: Navigation component | 9.6 | 0.0030 | | | [CVE-2026-100760](https://patchblox.com/security/data/cve/CVE-2026-100760.md) | Urgent | Sandbox escape in the Security: Process Sandboxing component | 9.6 | 0.0030 | | | [CVE-2026-100787](https://patchblox.com/security/data/cve/CVE-2026-100787.md) | Urgent | Sandbox escape in the XUL component | 9.6 | 0.0030 | | | [CVE-2026-100800](https://patchblox.com/security/data/cve/CVE-2026-100800.md) | Urgent | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.6 | 0.0029 | | | [CVE-2026-100804](https://patchblox.com/security/data/cve/CVE-2026-100804.md) | Urgent | Sandbox escape due to use-after-free in the Preferences: Backend component | 9.6 | 0.0028 | | | [CVE-2026-100811](https://patchblox.com/security/data/cve/CVE-2026-100811.md) | Urgent | Sandbox escape due to use-after-free in the DOM: Core & HTML component | 9.6 | 0.0027 | | | [CVE-2026-100818](https://patchblox.com/security/data/cve/CVE-2026-100818.md) | Urgent | Sandbox escape due to use-after-free in the Widget: Gtk component | 9.6 | 0.0027 | | | [CVE-2026-100819](https://patchblox.com/security/data/cve/CVE-2026-100819.md) | Urgent | Sandbox escape due to incorrect boundary conditions in the XPCOM component | 9.6 | 0.0026 | | | [CVE-2026-100828](https://patchblox.com/security/data/cve/CVE-2026-100828.md) | Urgent | Mitigation bypass in the Bookmarks & History component | 9.6 | 0.0024 | | | [CVE-2026-100829](https://patchblox.com/security/data/cve/CVE-2026-100829.md) | Urgent | Mitigation bypass in the DOM: Security component | 9.6 | 0.0024 | | | [CVE-2026-100773](https://patchblox.com/security/data/cve/CVE-2026-100773.md) | High | Use-after-free in the Storage: IndexedDB component | 8.8 | 0.0040 | | | [CVE-2026-100791](https://patchblox.com/security/data/cve/CVE-2026-100791.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0040 | | | [CVE-2026-100783](https://patchblox.com/security/data/cve/CVE-2026-100783.md) | High | Uninitialized memory in the Audio/Video component | 7.5 | 0.0035 | | | [CVE-2026-100767](https://patchblox.com/security/data/cve/CVE-2026-100767.md) | High | Use-after-free in the Networking: Cache component | 8.8 | 0.0033 | | | [CVE-2026-100779](https://patchblox.com/security/data/cve/CVE-2026-100779.md) | High | Use-after-free in the XSLT component | 8.8 | 0.0033 | | | [CVE-2026-100784](https://patchblox.com/security/data/cve/CVE-2026-100784.md) | High | Use-after-free in the Layout: Text and Fonts component | 8.8 | 0.0033 | | | [CVE-2026-100757](https://patchblox.com/security/data/cve/CVE-2026-100757.md) | High | Use-after-free in the Widget component | 8.8 | 0.0032 | | | [CVE-2026-100774](https://patchblox.com/security/data/cve/CVE-2026-100774.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0032 | | | [CVE-2026-100777](https://patchblox.com/security/data/cve/CVE-2026-100777.md) | High | Use-after-free in the Graphics: Canvas2D component | 8.8 | 0.0032 | | | [CVE-2026-100780](https://patchblox.com/security/data/cve/CVE-2026-100780.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0032 | | | [CVE-2026-100785](https://patchblox.com/security/data/cve/CVE-2026-100785.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0032 | | | [CVE-2026-100789](https://patchblox.com/security/data/cve/CVE-2026-100789.md) | High | Use-after-free in the Graphics: Canvas2D component | 8.8 | 0.0032 | | | [CVE-2026-100790](https://patchblox.com/security/data/cve/CVE-2026-100790.md) | High | Use-after-free in the XSLT component | 8.8 | 0.0032 | | | [CVE-2026-100769](https://patchblox.com/security/data/cve/CVE-2026-100769.md) | High | Use-after-free in the JavaScript: WebAssembly component | 8.8 | 0.0032 | | | [CVE-2026-100772](https://patchblox.com/security/data/cve/CVE-2026-100772.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0031 | | | [CVE-2026-100776](https://patchblox.com/security/data/cve/CVE-2026-100776.md) | High | Use-after-free in the JavaScript: WebAssembly component | 8.8 | 0.0031 | | | [CVE-2026-100756](https://patchblox.com/security/data/cve/CVE-2026-100756.md) | High | Incorrect boundary conditions in the Audio/Video: Playback component | 8.1 | 0.0031 | | | [CVE-2026-100759](https://patchblox.com/security/data/cve/CVE-2026-100759.md) | High | Uninitialized memory in the Storage: Quota Manager component | 8.1 | 0.0031 | | | [CVE-2026-100771](https://patchblox.com/security/data/cve/CVE-2026-100771.md) | High | Undefined behavior in the DOM: Streams component | 8.1 | 0.0031 | | | [CVE-2026-100808](https://patchblox.com/security/data/cve/CVE-2026-100808.md) | High | Mitigation bypass in the DOM: Service Workers component | 8.8 | 0.0030 | | | [CVE-2026-100765](https://patchblox.com/security/data/cve/CVE-2026-100765.md) | High | Use-after-free in the JavaScript: WebAssembly component | 8.8 | 0.0029 | | | [CVE-2026-100768](https://patchblox.com/security/data/cve/CVE-2026-100768.md) | High | Use-after-free in the Graphics: WebGPU component | 8.8 | 0.0029 | | | [CVE-2026-100796](https://patchblox.com/security/data/cve/CVE-2026-100796.md) | High | Use-after-free in the JavaScript: WebAssembly component | 8.8 | 0.0028 | | | [CVE-2026-100801](https://patchblox.com/security/data/cve/CVE-2026-100801.md) | High | Privilege escalation in the DLL Services component | 8.8 | 0.0028 | | | [CVE-2026-100792](https://patchblox.com/security/data/cve/CVE-2026-100792.md) | High | JIT miscompilation in the JavaScript: WebAssembly component | 8.8 | 0.0026 | | | [CVE-2026-100782](https://patchblox.com/security/data/cve/CVE-2026-100782.md) | High | Privilege escalation due to incorrect boundary conditions in the Graphics component | 8.8 | 0.0026 | | | [CVE-2026-100797](https://patchblox.com/security/data/cve/CVE-2026-100797.md) | High | Privilege escalation due to use-after-free in the Graphics: WebRender component | 8.8 | 0.0025 | | | [CVE-2026-100766](https://patchblox.com/security/data/cve/CVE-2026-100766.md) | High | Information disclosure in the Networking: JAR component | 7.5 | 0.0025 | | | [CVE-2026-100814](https://patchblox.com/security/data/cve/CVE-2026-100814.md) | High | Incorrect boundary conditions in the JavaScript Engine: JIT component | 8.8 | 0.0024 | | | [CVE-2026-96869](https://patchblox.com/security/data/cve/CVE-2026-96869.md) | High | Information disclosure in the Networking component | 7.5 | 0.0024 | | | [CVE-2026-100820](https://patchblox.com/security/data/cve/CVE-2026-100820.md) | High | Privilege escalation in the Address Bar component | 8.8 | 0.0024 | | | [CVE-2026-100815](https://patchblox.com/security/data/cve/CVE-2026-100815.md) | High | Use-after-free in the CSS Parsing and Computation component | 8.8 | 0.0024 | | | [CVE-2026-100831](https://patchblox.com/security/data/cve/CVE-2026-100831.md) | High | Use-after-free in the DOM: UI Events & Focus Handling component | 8.8 | 0.0024 | | | [CVE-2026-100807](https://patchblox.com/security/data/cve/CVE-2026-100807.md) | High | Privilege escalation in the DOM: Service Workers component | 8.8 | 0.0023 | | | [CVE-2026-100825](https://patchblox.com/security/data/cve/CVE-2026-100825.md) | High | Use-after-free in the JavaScript Engine: JIT component | 8.8 | 0.0023 | | | [CVE-2026-100764](https://patchblox.com/security/data/cve/CVE-2026-100764.md) | High | Privilege escalation due to incorrect boundary conditions in the Graphics: WebGPU component | 8.8 | 0.0023 | | | [CVE-2026-100813](https://patchblox.com/security/data/cve/CVE-2026-100813.md) | High | Invalid pointer in the JavaScript Engine: JIT component | 8.8 | 0.0023 | | | [CVE-2026-100761](https://patchblox.com/security/data/cve/CVE-2026-100761.md) | High | Privilege escalation due to use-after-free in the Graphics: WebGPU component | 8.8 | 0.0023 | | | [CVE-2026-100824](https://patchblox.com/security/data/cve/CVE-2026-100824.md) | High | Privilege escalation in the Places component | 8.8 | 0.0022 | | | [CVE-2026-100805](https://patchblox.com/security/data/cve/CVE-2026-100805.md) | High | Race condition, use-after-free in the Audio/Video component | 7.5 | 0.0021 | | | [CVE-2026-100798](https://patchblox.com/security/data/cve/CVE-2026-100798.md) | High | Cryptography misuse in Storage: Quota Manager component | 8.1 | 0.0019 | | | [CVE-2026-100803](https://patchblox.com/security/data/cve/CVE-2026-100803.md) | High | Same-origin policy bypass in the WebExtensions component | 8.1 | 0.0017 | | | [CVE-2026-100809](https://patchblox.com/security/data/cve/CVE-2026-100809.md) | High | Same-origin policy bypass in the DevTools component | 8.1 | 0.0015 | | | [CVE-2026-100816](https://patchblox.com/security/data/cve/CVE-2026-100816.md) | High | Site isolation issue in the DOM: Networking component | 8.1 | 0.0015 | | | [CVE-2026-100821](https://patchblox.com/security/data/cve/CVE-2026-100821.md) | High | Site isolation issue in the Panning and Zooming component | 7.5 | 0.0014 | | | [CVE-2026-100830](https://patchblox.com/security/data/cve/CVE-2026-100830.md) | High | Mitigation bypass in the DOM: Navigation component | 8.1 | 0.0014 | | | [CVE-2026-100822](https://patchblox.com/security/data/cve/CVE-2026-100822.md) | Routine | Spoofing issue in the Networking: HTTP component | 5.4 | 0.0028 | | | [CVE-2026-103500](https://patchblox.com/security/data/cve/CVE-2026-103500.md) | Routine | Heap buffer overflow opening large email | 6.1 | 0.0028 | | | [CVE-2026-100812](https://patchblox.com/security/data/cve/CVE-2026-100812.md) | Routine | Denial-of-service in the Graphics component | 6.5 | 0.0027 | | | [CVE-2026-100793](https://patchblox.com/security/data/cve/CVE-2026-100793.md) | Routine | JIT miscompilation in the JavaScript Engine component | 6.5 | 0.0027 | | | [CVE-2026-100795](https://patchblox.com/security/data/cve/CVE-2026-100795.md) | Routine | Denial-of-service in the Networking component | 6.5 | 0.0026 | | | [CVE-2026-100806](https://patchblox.com/security/data/cve/CVE-2026-100806.md) | Routine | Uninitialized memory in the Graphics: WebGPU component | 4.3 | 0.0025 | | | [CVE-2026-100799](https://patchblox.com/security/data/cve/CVE-2026-100799.md) | Routine | Uninitialized memory in the Graphics: WebGPU component | 4.3 | 0.0024 | | | [CVE-2026-100802](https://patchblox.com/security/data/cve/CVE-2026-100802.md) | Routine | Uninitialized memory in the Graphics: WebGPU component | 4.3 | 0.0024 | | | [CVE-2026-100826](https://patchblox.com/security/data/cve/CVE-2026-100826.md) | Routine | Denial-of-service in the Storage: StorageManager component | 6.5 | 0.0022 | | | [CVE-2026-100817](https://patchblox.com/security/data/cve/CVE-2026-100817.md) | Routine | Other issue in the JavaScript: WebAssembly component | 5.4 | 0.0020 | | --- Data as of 2026-11-09T19:38:12Z UTC. 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