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Debian 11: firefox-esr Critical Security Issue DLA-4305-1 CVE-2025-10527

debian lts
Calendar Grey September 19, 2025
Dist Debian Esm H88
Google Chrome patches released to mitigate several serious vulnerabilities, protecting against unauthorized access and information breaches.
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 critical debian arbitrary code execution information disclosure firefox-esr

Summary

Debian follows the extended support releases (ESR) of Firefox.
So starting with this update we're now following the 140.x releases.

Between 128.x and 140.x, Firefox has seen a number of feature
updates. For more information please refer to
https://www.firefox.com/en-US/firefox/140.0esr/releasenotes/

For Debian 11 bullseye, these problems have been fixed in version
140.3.0esr-1~deb11u2.

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: 140.3.0esr-1~deb11u2
CVE ID: CVE-2025-10527 CVE-2025-10528 CVE-2025-10529 CVE-2025-10532

Topics%20covered

Topics Covered

security advisory critical debian arbitrary code execution information disclosure firefox-esr

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