Debian 11 firefox-esr Critical Code Execution Issues DLA-4555-1
debian lts
April 30, 2026
Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, information disclosure or sandbox es...
Summary
For Debian 11 bullseye, these problems have been fixed in version
140.10.1esr-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/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
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Critical
Package: firefox-esr
Version: 140.10.1esr-1~deb11u1
CVE ID: CVE-2026-7320 CVE-2026-7321 CVE-2026-7322 CVE-2026-7323
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