CVE-2025-8034

NameCVE-2025-8034
DescriptionMemory safety bugs present in Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. 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 < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-4250-1, DLA-4253-1, DSA-5964-1, DSA-5966-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid143.0.3-1fixed
firefox-esr (PTS)bullseye115.14.0esr-1~deb11u1vulnerable
bullseye (security)140.3.1esr-1~deb11u1fixed
bookworm128.14.0esr-1~deb12u1fixed
bookworm (security)140.3.1esr-1~deb12u1fixed
trixie128.14.0esr-1~deb13u1fixed
trixie (security)140.3.1esr-1~deb13u1fixed
forky, sid140.3.1esr-2fixed
thunderbird (PTS)bullseye1:115.12.0-1~deb11u1vulnerable
bullseye (security)1:140.3.0esr-1~deb11u1fixed
bookworm1:128.14.0esr-1~deb12u1fixed
bookworm (security)1:140.3.0esr-1~deb12u1fixed
trixie1:128.14.0esr-1~deb13u1fixed
trixie (security)1:140.3.0esr-1~deb13u1fixed
forky1:140.3.0esr-1fixed
sid1:140.3.1esr-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)141.0-1
firefox-esrsourcebullseye128.13.0esr-1~deb11u1DLA-4250-1
firefox-esrsourcebookworm128.13.0esr-1~deb12u1DSA-5964-1
firefox-esrsource(unstable)128.13.0esr-1
thunderbirdsourcebullseye1:128.13.0esr-1~deb11u1DLA-4253-1
thunderbirdsourcebookworm1:128.13.0esr-1~deb12u1DSA-5966-1
thunderbirdsource(unstable)1:128.13.0esr-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2025-56/#CVE-2025-8034
https://www.mozilla.org/en-US/security/advisories/mfsa2025-58/#CVE-2025-8034
https://www.mozilla.org/en-US/security/advisories/mfsa2025-62/#CVE-2025-8034

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