| Name | CVE-2026-15718 |
| Description | We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13. |
| 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 | DLA-4695-1, DLA-4727-1, DSA-6394-1, DSA-6418-1 |
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 | fixed | |
| trixie | 140.12.0esr-1~deb13u1 | vulnerable | |
| trixie (security) | 140.14.0esr-1~deb13u1 | fixed | |
| forky | 140.14.0esr-2 | fixed | |
| sid | 140.15.0esr-1 | fixed | |
| thunderbird (PTS) | bookworm | 1:140.12.0esr-1~deb12u1 | vulnerable |
| bookworm (security) | 1:140.14.0esr-1~deb12u1 | fixed | |
| trixie | 1:140.12.0esr-1~deb13u1 | vulnerable | |
| trixie (security) | 1:140.14.0esr-1~deb13u1 | fixed | |
| forky | 1:140.14.0esr-1 | fixed | |
| 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) | 152.0.6-1 | |||
| firefox-esr | source | bullseye | 140.13.0esr-1~deb11u1 | DLA-4695-1 | ||
| firefox-esr | source | bookworm | 140.13.0esr-1~deb12u1 | DLA-4695-1 | ||
| firefox-esr | source | trixie | 140.13.0esr-1~deb13u1 | DSA-6394-1 | ||
| firefox-esr | source | (unstable) | 140.13.0esr-1 | |||
| thunderbird | source | bullseye | 1:140.13.0esr-2~deb11u1 | DLA-4727-1 | ||
| thunderbird | source | bookworm | 1:140.13.0esr-2~deb12u1 | DLA-4727-1 | ||
| thunderbird | source | trixie | 1:140.13.0esr-2~deb13u1 | DSA-6418-1 | ||
| thunderbird | source | (unstable) | 1:140.13.0esr-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2026-67/#CVE-2026-15718
https://www.mozilla.org/en-US/security/advisories/mfsa2026-70/#CVE-2026-15718
https://www.mozilla.org/en-US/security/advisories/mfsa2026-72/#CVE-2026-15718