Debian issued two security advisories to address critical flaws in Thunderbird and LXD. The Thunderbird patch for Debian GNU/Linux 11 (Bullseye) LTS resolves several vulnerabilities that could allow attackers to run arbitrary code on affected systems. A separate update for the LXD container platform for both Debian GNU/Linux 12 (Bookworm) and 13 (Trixie) fixes multiple issues that might otherwise trigger denial of service attacks. System administrators should apply these package upgrades immediately to keep their networks secure.

[DLA 4562-1] thunderbird security update
[DSA 6247-1] lxd security update

[SECURITY] [DLA 4562-1] thunderbird security update

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Debian LTS Advisory DLA-4562-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
May 04, 2026 https://wiki.debian.org/LTS
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Package : thunderbird
Version : 1:140.10.1esr-1~deb11u1
CVE ID : CVE-2026-7320 CVE-2026-7321 CVE-2026-7322 CVE-2026-7323

Multiple security issues were discovered in Thunderbird, which could
result in the execution of arbitrary code.

For Debian 11 bullseye, these problems have been fixed in version
1:140.10.1esr-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/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

[SECURITY] [DSA 6247-1] lxd security update

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Debian Security Advisory DSA-6247-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
May 04, 2026 https://www.debian.org/security/faq
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Package : lxd
CVE ID : CVE-2026-40197 CVE-2026-40251 CVE-2026-41648
CVE-2026-41684 CVE-2026-41685

Multiple security issues were discovered in LXD, a system container
and virtual machine manager, which could result in denial of service.

For the oldstable distribution (bookworm), these problems have been fixed
in version 5.0.2-5+deb12u6.

For the stable distribution (trixie), these problems have been fixed in
version 5.0.2+git20231211.1364ae4-9+deb13u6.

We recommend that you upgrade your lxd packages.

For the detailed security status of lxd please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/lxd

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/