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Alerts This Week
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Debian 11 DLA-4526-1 Firefox-esr Critical Exec Code Threat

debian lts
Calendar Grey April 11, 2026
Dist Debian Esm H88
Critical security issues in Firefox-esr for Debian 11 addressed in advisory DLA-4526-1. Upgrade now to protect your system.
Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code
Topics%20covered

Topics Covered

security advisory critical debian DoS execution issue firefox-esr

Summary

For Debian 11 bullseye, these problems have been fixed in version
140.9.1esr-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: 140.9.1esr-1~deb11u1
CVE ID: CVE-2026-5731 CVE-2026-5732 CVE-2026-5734

Topics%20covered

Topics Covered

security advisory critical debian DoS execution issue firefox-esr

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