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[SECURITY] [DLA 3736-1] unbound security update

Debian LTS Advisory DLA-3736-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                      Markus Koschany
February 21, 2024                             https://wiki.debian.org/LTS

Package        : unbound
Version        : 1.9.0-2+deb10u4
CVE ID         : CVE-2023-50387 CVE-2023-50868
Debian Bug     : 1063845

Two vulnerabilities were discovered in unbound, a validating, recursive,
caching DNS resolver. Specially crafted DNSSEC answers could lead unbound
down a very CPU intensive and time costly DNSSEC (CVE-2023-50387) or NSEC3
hash (CVE-2023-50868) validation path, resulting in denial of service.

For Debian 10 buster, these problems have been fixed in version

We recommend that you upgrade your unbound packages.

For the detailed security status of unbound please refer to
its security tracker page at:

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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