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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
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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
1.9.0-2+deb10u4.

We recommend that you upgrade your unbound packages.

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

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