Home / mailings [SECURITY] [DSA 6350-1] firefox-esr security update
Posted on 17 June 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6350-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
June 17, 2026 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2026-12289 CVE-2026-12290 CVE-2026-12291 CVE-2026-12292
CVE-2026-12294 CVE-2026-12295 CVE-2026-12296 CVE-2026-12297
CVE-2026-12298 CVE-2026-12299 CVE-2026-12302 CVE-2026-12304
CVE-2026-12305 CVE-2026-12306 CVE-2026-12307 CVE-2026-12308
CVE-2026-12309 CVE-2026-12310 CVE-2026-12311 CVE-2026-12312
CVE-2026-12313 CVE-2026-12314 CVE-2026-12315 CVE-2026-12324
CVE-2026-12325 CVE-2026-12327 CVE-2026-12328 CVE-2026-12329
CVE-2026-12330
Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, bypass of the same-origin policy, privilege escalation,
information disclosure, spoofing or sandbox escape.
For the stable distribution (trixie), these problems have been fixed in
version 140.12.0esr-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
