Irvan Kurniawan discovered a double free in the libwebp image compression library which may result in denial of service.
For the stable distribution (bullseye), this problem has been fixed in version 0.6.1-2.1+deb11u1.
We recommend that you upgrade your libwebp packages.
For the detailed security status of libwebp please refer to its security tracker page at: \ https://security-tracker.debian.org/tracker/libwebp