A lighttpd security update has been released for Debian GNU/Linux 10 and 11 to address an out-of-bounds memory access in the mod_extforward plugin.

DSA 5040-1: lighttpd security update

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Debian Security Advisory DSA-5040-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 11, 2022   https://www.debian.org/security/faq
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Package : lighttpd
CVE ID : CVE-2022-22707

An out-of-bounds memory access was discovered in the mod_extforward plugin of
the lighttpd web server, which may result in denial of service.

For the oldstable distribution (buster), this problem has been fixed
in version 1.4.53-4+deb10u2.

For the stable distribution (bullseye), this problem has been fixed in
version 1.4.59-1+deb11u1.

We recommend that you upgrade your lighttpd packages.

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

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/