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Debian Releases Security Updates for Firefox-ESR Vulnerabilities

Debian Releases Security Updates for Firefox-ESR Vulnerabilities

First seen 19 Jun 2026, 10:53 UTC

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ThreatCluster AI
ThreatCluster June 20, 2026 at 10:52 UTC
  • Debian has released security updates for Firefox-ESR across multiple versions.
  • Users are urged to upgrade their firefox-esr packages to the latest versions.
  • The vulnerabilities fixed affect Debian 11 bullseye, Debian 12 bookworm, and stable distribution trixie.

Debian has released security advisories addressing vulnerabilities in Firefox-ESR across multiple versions. For Debian 11 (bullseye), the issues have been resolved in version 140.12.0esr-1~deb11u1, while Debian 12 (bookworm) received the fix in version 140.12.0esr-1~deb12u1. Additionally, the stable distribution (trixie) has been patched in version 140.12.0esr-1~deb13u1. Users are strongly advised to upgrade their firefox-esr packages to mitigate potential security risks. The specific vulnerabilities and their impact details were not disclosed in the articles. The updates are critical for maintaining system security and preventing exploitation. For further details, users can refer to the security tracker pages linked in the advisories.

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Timeline

2026-06-17
Debian DSA-6350 released
Debian announced security fixes for Firefox-ESR in the stable distribution (trixie).
Linuxsecurity
2026-06-19
Debian LTS DLA-4635 published
Debian released security updates for Firefox-ESR in Debian 11 and 12.
Linuxsecurity

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