Debian: DSA-5110-1 Important: PNG Buffer Overflow Vulnerabilities

Multiple vulnerabilities have been discovered in the libtiff library
and the included tools, which may result in denial of service if
malformed image files are processed.

For the oldstable distribution (buster), these problems have been fixed
in version 4.1.0+git191117-2~deb10u4.

For the stable distribution (bullseye), these problems have been fixed in
version 4.2.0-1+deb11u1.

We recommend that you upgrade your tiff packages.

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

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/