When GraphicsMagick 1.3.25 processes an RGB TIFF picture (with metadata indicating a single sample per pixel) in coders/tiff.c, a buffer overflow occurs, related to QuantumTransferMode.
https://www.debian.org/security/2018/dsa-4321
https://usn.ubuntu.com/4206-1/
https://sourceforge.net/p/graphicsmagick/code/ci/a20bee0a0ad216aa11a2be3de63b60ca6bef4106/