Leptonica before 1.80.0 allows a heap-based buffer over-read in pixReadFromTiffStream, related to tiffio.c.
https://security.gentoo.org/glsa/202107-53
https://github.com/DanBloomberg/leptonica/compare/1.79.0...1.80.0
https://github.com/DanBloomberg/leptonica/commit/5ba34b1fe741d69d43a6c8cf767756997eadd87c