| Name | CVE-2026-117973 |
| Description | Use-after-free in the Networking: DNS component. This vulnerability wa ... |
| 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) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| firefox (PTS) | sid | 158.0.1-1 | vulnerable |
| firefox-esr (PTS) | bookworm | 140.12.0esr-1~deb12u1 | vulnerable |
| bookworm (security) | 153.5.1esr-1~deb12u1 | vulnerable |
| trixie | 140.15.0esr-1~deb13u1 | vulnerable |
| trixie (security) | 153.5.1esr-1~deb13u1 | vulnerable |
| forky, sid | 153.5.1esr-1 | vulnerable |
| thunderbird (PTS) | bookworm | 1:140.12.0esr-1~deb12u1 | vulnerable |
| bookworm (security) | 1:153.5.1esr-1~deb12u1 | vulnerable |
| trixie | 1:140.12.0esr-1~deb13u1 | vulnerable |
| trixie (security) | 1:153.5.1esr-1~deb13u2 | vulnerable |
| forky | 1:153.5.0esr-1 | vulnerable |
| sid | 1:153.5.1esr-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) | | | |
| thunderbird | source | (unstable) | (unfixed) | | | |
Notes
https://www.mozilla.org/en-US/security/advisories/mfsa2026-118/#CVE-2026-117973
https://www.mozilla.org/en-US/security/advisories/mfsa2026-120/#CVE-2026-117973
https://www.mozilla.org/en-US/security/advisories/mfsa2026-122/#CVE-2026-117973