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Alerts This Week
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Debian LTS Thunderbird Critical Code Execution Advisory DLA-4636-1

debian lts
Calendar Grey June 19, 2026
Dist Debian Esm H88
Multiple security updates for Thunderbird in Debian LTS prevent execution of arbitrary code, enhancing system integrity.
Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary code
Topics%20covered

Topics Covered

security advisory arbitrary code execution thunderbird CVE deblts

Summary

For Debian 11 bullseye, these problems have been fixed in version
1:140.12.0esr-1~deb11u1.

For Debian 12 bookworm, these problems have been fixed in version
1:140.12.0esr-1~deb12u1.

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/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


Severity
critical
Lowest
Low
Medium
High
Critical

Package: thunderbird
Version: 1:140.12.0esr-1~deb11u1 1:140.12.0esr-1~deb12u1
CVE ID: CVE-2026-12289 CVE-2026-12290 CVE-2026-12291 CVE-2026-12292

Topics%20covered

Topics Covered

security advisory arbitrary code execution thunderbird CVE deblts

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