| Name | CVE-2026-2781 |
| Description | Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148, 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) |
| References | DLA-4495-1, DLA-4496-1, DSA-6148-1, DSA-6149-1, DSA-6152-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 148.0.2-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | vulnerable |
| bullseye (security) | 140.8.0esr-1~deb11u1 | fixed | |
| bookworm | 128.14.0esr-1~deb12u1 | vulnerable | |
| bookworm (security) | 140.8.0esr-1~deb12u1 | fixed | |
| trixie (security), trixie | 140.8.0esr-1~deb13u1 | fixed | |
| forky, sid | 140.8.0esr-1 | fixed | |
| nss (PTS) | bullseye | 2:3.61-1+deb11u3 | vulnerable |
| bullseye (security) | 2:3.61-1+deb11u4 | vulnerable | |
| bookworm | 2:3.87.1-1+deb12u1 | vulnerable | |
| bookworm (security) | 2:3.87.1-1+deb12u2 | fixed | |
| trixie (security), trixie | 2:3.110-1+deb13u1 | fixed | |
| forky, sid | 2:3.121-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | vulnerable |
| bullseye (security) | 1:140.8.0esr-1~deb11u1 | fixed | |
| bookworm | 1:140.6.0esr-1~deb12u1 | vulnerable | |
| bookworm (security) | 1:140.8.0esr-1~deb12u1 | fixed | |
| trixie (security), trixie | 1:140.8.0esr-1~deb13u1 | fixed | |
| forky, sid | 1:140.8.0esr-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) | 148.0-1 | |||
| firefox-esr | source | bullseye | 140.8.0esr-1~deb11u1 | DLA-4496-1 | ||
| firefox-esr | source | bookworm | 140.8.0esr-1~deb12u1 | DSA-6148-1 | ||
| firefox-esr | source | trixie | 140.8.0esr-1~deb13u1 | DSA-6148-1 | ||
| firefox-esr | source | (unstable) | 140.8.0esr-1 | |||
| nss | source | bookworm | 2:3.87.1-1+deb12u2 | DSA-6149-1 | ||
| nss | source | trixie | 2:3.110-1+deb13u1 | DSA-6149-1 | ||
| nss | source | (unstable) | 2:3.121-1 | |||
| thunderbird | source | bullseye | 1:140.8.0esr-1~deb11u1 | DLA-4495-1 | ||
| thunderbird | source | bookworm | 1:140.8.0esr-1~deb12u1 | DSA-6152-1 | ||
| thunderbird | source | trixie | 1:140.8.0esr-1~deb13u1 | DSA-6152-1 | ||
| thunderbird | source | (unstable) | 1:140.8.0esr-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2781
https://www.mozilla.org/en-US/security/advisories/mfsa2026-15/#CVE-2026-2781
https://www.mozilla.org/en-US/security/advisories/mfsa2026-17/#CVE-2026-2781
https://bugzilla.mozilla.org/show_bug.cgi?id=2009552 (private)
Fixed by: https://hg.mozilla.org/projects/nss/rev/245385e16fa6