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Debian 11: Firefox ESR Regression Fix Advisory DLA-4305-2

debian lts
Calendar Grey September 29, 2025
Dist Debian Esm H88
Upgrade your Firefox ESR to fix connection issues with HTTP/3 and enhance functionality as per DLA-4305-2.
Firefox 140.3.1 has been released, which fixes connection errors with some sites; if HTTP/3 connections failed, the fallback is now handled more gracefully
Topics%20covered

Topics Covered

security advisory software update debian regression firefox-esr connection error

Summary

For Debian 11 bullseye, this problem has been fixed in version
140.3.1esr-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
important
Lowest
Low
Medium
High
Critical

Package: firefox-esr
Version: 140.3.1esr-1~deb11u1

Topics%20covered

Topics Covered

security advisory software update debian regression firefox-esr connection error

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