An issue was discovered in Pillow before 8.1.1. In TiffDecode.c, there is a negative-offset memcpy with an invalid size.
https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html
https://security.gentoo.org/glsa/202107-33
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
Source: MITRE
Published: 2021-03-19
Updated: 2021-12-03
Type: CWE-787
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH