Home / mailings [SECURITY] [DSA 6451-1] firefox-esr security update
Posted on 19 August 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6451-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
August 19, 2026 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2026-74934 CVE-2026-74935 CVE-2026-74936 CVE-2026-74939
CVE-2026-74940 CVE-2026-74941 CVE-2026-74942 CVE-2026-74943
CVE-2026-74944 CVE-2026-74945 CVE-2026-74946 CVE-2026-74948
CVE-2026-74949 CVE-2026-74953 CVE-2026-74957 CVE-2026-74959
CVE-2026-74960 CVE-2026-74962 CVE-2026-74963 CVE-2026-74964
CVE-2026-74965 CVE-2026-74967 CVE-2026-74969 CVE-2026-74971
CVE-2026-74972 CVE-2026-74973 CVE-2026-74974 CVE-2026-74976
CVE-2026-74983 CVE-2026-74987 CVE-2026-74990
Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, privilege escalation, information disclosure or bypass of the
same-origin policy.
For the stable distribution (trixie), these problems have been fixed in
version 140.14.0esr-1~deb13u1.
We recommend that you upgrade your firefox-esr packages.
For the detailed security status of firefox-esr please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/firefox-esr
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
