Mozilla Foundation Security Advisory 2026-44
Security Vulnerabilities fixed in Thunderbird 140.10.2
- Announced
- May 8, 2026
- Impact
- high
- Products
- Thunderbird
- Fixed in
-
- Thunderbird 140.10.2
In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts.
#CVE-2026-8090: Use-after-free in the DOM: Networking component
- Reporter
- Kevin Brosnan
- Impact
- high
References
#CVE-2026-8094: Other issue in the WebRTC component
- Reporter
- Michael Froman
- Impact
- high
References
#CVE-2026-8092: Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thunderbird 150.0.2
- Reporter
- Andrew McCreight, Christian Holler, Lee Salzman, Maurice Dauer, Tom Schuster, Wayne Mery and the Mozilla Fuzzing Team
- Impact
- high
Description
Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.