| Name | CVE-2026-6771 |
| Description | Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. |
| 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) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 149.0.2-1 | vulnerable |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | vulnerable |
| bullseye (security) | 140.9.1esr-1~deb11u1 | vulnerable | |
| bookworm | 128.14.0esr-1~deb12u1 | vulnerable | |
| bookworm (security) | 140.9.1esr-1~deb12u1 | vulnerable | |
| trixie | 140.8.0esr-1~deb13u1 | vulnerable | |
| trixie (security) | 140.9.1esr-1~deb13u1 | vulnerable | |
| forky, sid | 140.9.1esr-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | (unfixed) | |||
| firefox-esr | source | (unstable) | (unfixed) |
https://www.mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6771
https://www.mozilla.org/en-US/security/advisories/mfsa2026-32/#CVE-2026-6771