Pillow through 8.2.0 and PIL (aka Python Imaging Library) through 1.1.7 allow an attacker to pass controlled parameters directly into a convert function to trigger a buffer overflow in Convert.c.
https://pillow.readthedocs.io/en/stable/releasenotes/index.html
https://pillow.readthedocs.io/en/stable/releasenotes/8.3.0.html#buffer-overflow
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
Source: MITRE
Published: 2021-07-13
Updated: 2021-09-20
Type: CWE-120
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL