For the oldstable distribution (bookworm), this problem has been fixed
in version 1.6.39-2+deb12u5.
For the stable distribution (trixie), this problem has been fixed in
version 1.6.48-1+deb13u5.
We recommend that you upgrade your libpng1.6 packages.
For the detailed security status of libpng1.6 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libpng1.6
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/
