A nghttp2 security update has been released for Debian GNU/Linux 11 and 12 to address an issue that could result in denial of service.

[SECURITY] [DSA 5570-1] nghttp2 security update

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Debian Security Advisory DSA-5570-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
December 01, 2023 https://www.debian.org/security/faq
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Package : nghttp2
CVE ID : CVE-2023-44487

It was discovered that libnghttp2, a library implementing the HTTP/2
protocol, handled request cancellation incorrectly. This could result
in denial of service.

For the oldstable distribution (bullseye), this problem has been fixed
in version 1.43.0-1+deb11u1.

For the stable distribution (bookworm), this problem has been fixed in
version 1.52.0-1+deb12u1.

We recommend that you upgrade your nghttp2 packages.

For the detailed security status of nghttp2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/nghttp2

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/