CVE-2021-28676

HIGH

Python Pillow < 8.2.0 - Infinite Loop

Title source: rule

Description

An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.

References (6)

[Patch] https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856

View Patch ZIP pw:eip

[Third Party Advisory] https://github.com/python-pillow/Pillow/pull/5377

[Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html

[Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/

[Release Notes, Third Party Advisory] https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos

[Third Party Advisory] https://security.gentoo.org/glsa/202107-33

Scores

CVSS v3 7.5

EPSS 0.0037

EPSS Percentile 58.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-835

Status published

Affected Products (3)

python/pillow < 8.2.0

fedoraproject/fedora

pypi/pillow < 8.2.0PyPI

Timeline

Published Jun 02, 2021

Tracked Since Feb 18, 2026