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Vulnerability record · CVE-2021-27922 · published 3 March 2021

CVE-2021-27922: Python pillow improper input validation vulnerability

Python · Pillow

Pillow before 8.1.2 allows attackers to cause a denial of service (memory consumption) because the reported size of a contained image is not properly checked for an ICNS container, and thus an attempted memory allocation can be very large.

7.5 CVSS 3.1 High EPSS 4.9% · top 8.3% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
4.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

Pillow before 8.1.2 allows attackers to cause a denial of service (memory consumption) because the reported size of a contained image is not properly checked for an ICNS container, and thus an attempted memory allocation can be very large.

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://lists.fedoraproject.org/archives/list/[email protected]/message/S7G44Z33J4BNI2DPDROHWGVG2
https://lists.fedoraproject.org/archives/list/[email protected]/message/TQQY6472RX4J2SUJENWDZAWKT
https://lists.fedoraproject.org/archives/list/[email protected]/message/ZTSY25UJU7NJUFHH3HWT575LT
https://pillow.readthedocs.io/en/stable/releasenotes/8.1.2.html
https://security.gentoo.org/glsa/202107-33 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7G44Z33J4BNI2DPDROHWGV
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQQY6472RX4J2SUJENWDZAW
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTSY25UJU7NJUFHH3HWT575
https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html Release NotesVendor Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-27922), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.