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Debian 11: Firefox-ESR Critical Issues Fixed DLA-4439-1

debian lts
Calendar Grey January 15, 2026
Dist Debian Esm H88
Debian LTS update addresses multiple security issues in firefox-esr. Upgrade recommended to prevent execution risks.
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 disclosu...
Topics%20covered

Topics Covered

security advisory debian information disclosure execution CVE firefox-esr

Summary

For Debian 11 bullseye, these problems have been fixed in version
140.7.0esr-1~deb11u1.

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/source-package/firefox-esr

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
critical
Lowest
Low
Medium
High
Critical

Package: firefox-esr
Version: 140.7.0esr-1~deb11u1
CVE ID: CVE-2025-14327 CVE-2026-0877 CVE-2026-0878 CVE-2026-0879

Topics%20covered

Topics Covered

security advisory debian information disclosure execution CVE firefox-esr

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