Mozilla Thunderbird ESR (en-US) 140.15.0
Mozilla Thunderbird ESR (en-US) 140.15.0, released September 1, 2026, fixes 29 CVEs in Mozilla Thunderbird ESR (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird ESR (en-US) is 153.7.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird ESR (en-US) is 153.7.0, which also fixes every CVE on this page. Install that instead.
Priority of the 29 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird ESR (en-US) | 140.15.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-16357 | Incorrect boundary conditions in the Graphics component | 9.8 | 0.0087 | None reported |
| Urgent | CVE-2026-16353 | Invalid pointer in the DOM: Bindings (WebIDL) component | 9.8 | 0.0052 | None reported |
| Urgent | CVE-2026-16360 | Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153 | 9.8 | 0.0047 | None reported |
| Urgent | CVE-2026-16363 | JIT miscompilation in the JavaScript: WebAssembly component | 9.8 | 0.0044 | None reported |
| Urgent | CVE-2026-16369 | Integer overflow in the JavaScript: WebAssembly component | 9.8 | 0.0044 | None reported |
| Urgent | CVE-2026-16350 | Incorrect boundary conditions in the Audio/Video: cubeb component | 9.8 | 0.0041 | None reported |
| Urgent | CVE-2026-16355 | JIT miscompilation in the JavaScript Engine: JIT component | 9.8 | 0.0041 | None reported |
| Urgent | CVE-2026-16351 | Sandbox escape due to use-after-free in the DOM: Navigation component | 9.8 | 0.0039 | None reported |
| Urgent | CVE-2026-16352 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.8 | 0.0039 | None reported |
| Urgent | CVE-2026-16356 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.8 | 0.0039 | None reported |
| Urgent | CVE-2026-16368 | Incorrect boundary conditions in the JavaScript: WebAssembly component | 9.8 | 0.0039 | None reported |
| Urgent | CVE-2026-16377 | Mitigation bypass in the PDF Viewer component | 9.8 | 0.0039 | None reported |
| Urgent | CVE-2026-16383 | Mitigation bypass in the DOM: Networking component | 9.8 | 0.0039 | None reported |
| Urgent | CVE-2026-16390 | Mitigation bypass in the Enterprise Policies component | 9.1 | 0.0032 | None reported |
| Urgent | CVE-2026-16361 | Memory safety bugs fixed in Thunderbird ESR 140.13 | 9.8 | 0.0032 | None reported |
| Urgent | CVE-2026-16359 | Incorrect boundary conditions in the Audio/Video: GMP component | 9.1 | 0.0026 | None reported |
| Urgent | CVE-2026-16358 | Site isolation issue in the Graphics: WebRender component | 9.8 | 0.0022 | None reported |
| Urgent | CVE-2026-16349 | Same-origin policy bypass in the DOM: Navigation component | 9.8 | 0.0022 | None reported |
| Urgent | CVE-2026-16375 | Site isolation issue in the Networking: HTTP component | 9.8 | 0.0021 | None reported |
| Urgent | CVE-2026-16387 | Site isolation issue in the Networking component | 9.8 | 0.0020 | None reported |
| Urgent | CVE-2026-16381 | Same-origin policy bypass in the Networking: DNS component | 9.1 | 0.0017 | None reported |
| High | CVE-2026-14899 | Off-by-one out of bounds read in MIME header parser for forwarding | 8.8 | 0.0047 | None reported |
| High | CVE-2026-16354 | Information disclosure in the Graphics: ImageLib component | 8.8 | 0.0034 | None reported |
| High | CVE-2026-16374 | Information disclosure in the Framework component in DevTools | 8.8 | 0.0032 | None reported |
| High | CVE-2026-16391 | Information disclosure in the Storage: IndexedDB component | 8.8 | 0.0032 | None reported |
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