Home / mailings [SECURITY] [DSA 6533-1] firefox-esr security update
Posted on 30 September 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6533-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
September 30, 2026 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2026-96869 CVE-2026-100756 CVE-2026-100757 CVE-2026-100758
CVE-2026-100759 CVE-2026-100760 CVE-2026-100762 CVE-2026-100765
CVE-2026-100766 CVE-2026-100767 CVE-2026-100769 CVE-2026-100770
CVE-2026-100771 CVE-2026-100772 CVE-2026-100773 CVE-2026-100774
CVE-2026-100775 CVE-2026-100776 CVE-2026-100777 CVE-2026-100778
CVE-2026-100779 CVE-2026-100780 CVE-2026-100781 CVE-2026-100782
CVE-2026-100783 CVE-2026-100784 CVE-2026-100785 CVE-2026-100786
CVE-2026-100787 CVE-2026-100788 CVE-2026-100789 CVE-2026-100790
CVE-2026-100791 CVE-2026-100792 CVE-2026-100794 CVE-2026-100797
CVE-2026-100798 CVE-2026-100800 CVE-2026-100801 CVE-2026-100803
CVE-2026-100806 CVE-2026-100807 CVE-2026-100808 CVE-2026-100809
CVE-2026-100811 CVE-2026-100812 CVE-2026-100814 CVE-2026-100815
CVE-2026-100816 CVE-2026-100818 CVE-2026-100819 CVE-2026-100820
CVE-2026-100821 CVE-2026-100822 CVE-2026-100824 CVE-2026-100825
CVE-2026-100826 CVE-2026-100828 CVE-2026-100829 CVE-2026-100830
CVE-2026-100831 CVE-2026-100832
Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, sandbox escape, information disclosure or privilege escalation.
Debian follows the extended support releases (ESR) of Firefox. Starting
with this update we're now following the 153.x releases.
Between 140.x and 153.x, Firefox has seen a number of feature
updates. For more information please refer to
https://www.firefox.com/en-US/firefox/153.0esr/releasenotes/
For the stable distribution (trixie), these problems have been fixed in
version 153.4.0esr-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
