In Pillow before 8.1.0, SGIRleDecode has a 4-byte buffer over-read when decoding crafted SGI RLE image files because offsets and length tables are mishandled.
Gentoo Linux Security Advisory 202101-8 - Multiple vulnerabilities have been found in Pillow, the worst of which could result in a Denial of Service condition. Versions less than 8.1.0 are affected.