There is a way to crash the gif2rgb cli tool with bad arguments, that has no fix, but:
1. There is a warning in the man page https://man.archlinux.org/man/gif2rgb.1.en that bad input may core dump the tool,
so it's up to the user to sanitize the input
2. It's in gif2rgb which is usually not installed.
https://sourceforge.net/p/giflib/bugs/166/
https://security-tracker.debian.org/tracker/CVE-2023-39742