Home / mailings [SECURITY] [DSA 6148-1] firefox-esr security update
Posted on 25 February 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6148-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
February 25, 2026 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2026-2757 CVE-2026-2758 CVE-2026-2759 CVE-2026-2760
CVE-2026-2761 CVE-2026-2762 CVE-2026-2763 CVE-2026-2764
CVE-2026-2765 CVE-2026-2766 CVE-2026-2767 CVE-2026-2768
CVE-2026-2769 CVE-2026-2770 CVE-2026-2771 CVE-2026-2772
CVE-2026-2773 CVE-2026-2774 CVE-2026-2775 CVE-2026-2777
CVE-2026-2778 CVE-2026-2779 CVE-2026-2780 CVE-2026-2781
CVE-2026-2782 CVE-2026-2783 CVE-2026-2784 CVE-2026-2785
CVE-2026-2786 CVE-2026-2787 CVE-2026-2788 CVE-2026-2789
CVE-2026-2790 CVE-2026-2791 CVE-2026-2792 CVE-2026-2793
Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, sandbox escape, bypass of the same-origin policy, information
disclosure or privilege escalation.
For the oldstable distribution (bookworm), these problems have been fixed
in version 140.8.0esr-1~deb12u1.
For the stable distribution (trixie), these problems have been fixed in
version 140.8.0esr-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
