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Debian Bookworm Firefox ESR Critical Security Issues DSA-6178-1

debian
Calendar Grey March 25, 2026
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Discover critical security issues in Mozilla Firefox and upgrade your Debian system to avoid arbitrary code execution and privilege escalation.
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 denial of service debian privilege escalation arbitrary code execution information disclosure

Summary

For the oldstable distribution (bookworm), these problems have been
fixed in version 140.9.0esr-1~deb12u1.

For the stable distribution (trixie), these problems have been fixed in
version 140.9.0esr-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/



Severity
critical
Lowest
Low
Medium
High
Critical

Package: firefox-esr
CVE ID: CVE-2025-59375 CVE-2026-4684 CVE-2026-4685 CVE-2026-4686

Topics%20covered

Topics Covered

security advisory denial of service debian privilege escalation arbitrary code execution information disclosure

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