Mozilla Thunderbird ESR (da) 140.11.0
Mozilla Thunderbird ESR (da) 140.11.0, released May 19, 2026, fixes 4 CVEs in Mozilla Thunderbird ESR (da). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird ESR (da) is 153.7.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird ESR (da) is 153.7.0, which also fixes every CVE on this page. Install that instead.
Priority of the 4 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird ESR (da) | 140.11.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2026-8946 | Incorrect boundary conditions in the Audio/Video: Web Codecs component | 7.5 | 0.0056 | None reported |
| High | CVE-2026-8953 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.6 | 0.0053 | None reported |
| High | CVE-2026-8954 | Incorrect boundary conditions, integer overflow in the Audio/Video component | 7.5 | 0.0043 | None reported |
| High | CVE-2026-8947 | Use-after-free in the DOM: Bindings (WebIDL) component | 7.5 | 0.0041 | None reported |
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