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Vulnerability record · CVE-2021-28676 · published 2 June 2021

CVE-2021-28676: Python pillow vulnerability

Python · Pillow

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.

7.5 CVSS 3.1 High EPSS 2.5% · top 15.9% CWE-835 · CWE-835
7.5CVSS 3.1 base score, v2 5.0
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856 Patch
https://github.com/python-pillow/Pillow/pull/5377 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF Mailing List
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos Release NotesThird Party Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory
https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856 Patch
https://github.com/python-pillow/Pillow/pull/5377 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF Mailing List
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos Release NotesThird Party Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory

Track CVE-2021-28676 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-28676), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.