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Debian: Firefox ESR Critical Code Execution Risks DSA-6003-1

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Calendar Grey September 18, 2025
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Serious vulnerabilities identified in Firefox ESR may result in unauthorized code execution and other potential threats.
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...

Summary

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 bypass of the same-origin
policy.

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 the oldstable distribution (bookworm), these problems have been fixed
in version 140.3.0esr-1~deb12u1.

For the stable distribution (trixie), these problems have been fixed in
version 140.3.0esr-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/source-package/firefox-esr

Further information about Debian Security Advisories, how to a...

Read the Full Advisory

Severity
critical
Lowest
Low
Medium
High
Critical

Package: firefox-esr
CVE ID: CVE-2025-10527 CVE-2025-10528 CVE-2025-10529

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