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)
Core 6
Core References
Mailing List vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202107-33
Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
Third Party Advisory
https://github.com/python-pillow/Pillow/pull/5377
Release Notes, Third Party Advisory
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos
Scores
CVSS v3
7.5
EPSS
0.0037
EPSS Percentile
58.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-835
Status
published
Products (3)
fedoraproject/fedora
33
pypi/pillow
0 - 8.2.0PyPI
python/pillow
< 8.2.0
Published
Jun 02, 2021
Tracked Since
Feb 18, 2026