Leptonica before 1.80.0 allows a denial of service (application crash) via an incorrect left shift in pixConvert2To8 in pixconv.c.
https://security.gentoo.org/glsa/202107-53
https://lists.debian.org/debian-lts-announce/2021/03/msg00037.html
https://github.com/DanBloomberg/leptonica/pull/499
https://github.com/DanBloomberg/leptonica/compare/1.79.0...1.80.0