Debian: DSA-5040-1 Critical: Lighttpd DoS Out-Of-Bounds Access

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/source-package/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/