Debian 11: Thunderbird Critical Arbitrary Code Exec Advisory DLA-4442-1
debian lts
January 19, 2026
Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary code
Topics Covered
Summary
For Debian 11 bullseye, these problems have been fixed in version
1:140.7.0esr-1~deb11u1.
We recommend that you upgrade your thunderbird packages.
For the detailed security status of thunderbird please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/thunderbird
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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Severity
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Critical
Package: thunderbird
Version: 1:140.7.0esr-1~deb11u1
CVE ID: CVE-2025-14327 CVE-2026-0877 CVE-2026-0878 CVE-2026-0879
Topics Covered
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