Debian/thunderbird: high 7.5
Race condition, use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Action: Upgrade thunderbird to 1:140.9.0esr-1~deb13u1 or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 1:140.9.0esr-1~deb13u1 | - |
Fixed versions
| 1:140.9.0esr-1~deb13u1 |
Sources
- osv: DEBIAN-CVE-2026-4684#Debian:13/thunderbird
- https://security-tracker.debian.org/tracker/CVE-2026-4684
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