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Alerts This Week
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Debian 11 firefox-esr Important Exec Code Denial of Service DLA-4510-1

debian lts
Calendar Grey March 26, 2026
Dist Debian Esm H88
Critical updates for firefox-esr on Debian LTS fix multiple security issues affecting the web browser.
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 important arbitrary code exec code

Summary

For Debian 11 bullseye, these problems have been fixed in version
140.9.0esr-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
important
Lowest
Low
Medium
High
Critical

Package: firefox-esr
Version: 140.9.0esr-1~deb11u1
CVE ID: CVE-2025-59375 CVE-2026-4684 CVE-2026-4685 CVE-2026-4686

Topics%20covered

Topics Covered

security advisory debian important arbitrary code exec code

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