The DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later shipped in cgif.c in sam2p 0.49.4, has a heap-based buffer...

References

• advisory http://www.securityfocus.com/bid/104327
• advisory https://github.com/pts/sam2p/issues/38
• advisory https://lists.debian.org/debian-lts-announce/2022/12/msg00008.html
• advisory https://usn.ubuntu.com/4107-1/