| Name | CVE-2026-84131 |
| Description | Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6481-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 155.0-1 | fixed |
| firefox-esr (PTS) | bookworm | 140.12.0esr-1~deb12u1 | vulnerable |
| bookworm (security) | 140.14.0esr-1~deb12u1 | vulnerable | |
| trixie | 140.12.0esr-1~deb13u1 | vulnerable | |
| trixie (security) | 140.14.0esr-1~deb13u1 | vulnerable | |
| forky | 140.14.0esr-2 | vulnerable | |
| sid | 140.15.0esr-1 | fixed | |
| thunderbird (PTS) | bookworm | 1:140.12.0esr-1~deb12u1 | vulnerable |
| bookworm (security) | 1:140.14.0esr-1~deb12u1 | vulnerable | |
| trixie | 1:140.12.0esr-1~deb13u1 | vulnerable | |
| trixie (security) | 1:140.14.0esr-1~deb13u1 | vulnerable | |
| forky | 1:140.14.0esr-1 | vulnerable | |
| sid | 1:153.2.0esr-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | 155.0-1 | |||
| firefox-esr | source | trixie | 140.15.0esr-1~deb13u1 | DSA-6481-1 | ||
| firefox-esr | source | (unstable) | 140.15.0esr-1 | |||
| thunderbird | source | (unstable) | 1:153.2.0esr-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2026-82/#CVE-2026-84131
https://www.mozilla.org/en-US/security/advisories/mfsa2026-84/#CVE-2026-84131
https://www.mozilla.org/en-US/security/advisories/mfsa2026-87/#CVE-2026-84131