| Name | CVE-2026-2793 |
| Description | Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. |
| 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 | 147.0.4-1 | vulnerable |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | vulnerable |
| bullseye (security) | 140.7.0esr-1~deb11u1 | vulnerable | |
| bookworm | 128.14.0esr-1~deb12u1 | vulnerable | |
| bookworm (security) | 140.7.0esr-1~deb12u1 | vulnerable | |
| trixie | 140.4.0esr-1~deb13u1 | vulnerable | |
| trixie (security) | 140.7.0esr-1~deb13u1 | vulnerable | |
| forky, sid | 140.7.0esr-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/mfsa2026-13/#CVE-2026-2793
https://www.mozilla.org/en-US/security/advisories/mfsa2026-15/#CVE-2026-2793