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Vulnerability record · CVE-2021-23437 · published 3 September 2021

CVE-2021-23437: Python pillow out-of-bounds read vulnerability

Python · Pillow

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function.

7.5 CVSS 3.1 High EPSS 3.2% · top 12.4% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score, v2 5.0
3.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function.

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/9e08eb8f78fdfd2f476e1b20b7cf38683754866b PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00021.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RNSG6VFXTAROGF7ACYLMAZN
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VKRCL7KKAKOXCVD7M6WC5OK
https://pillow.readthedocs.io/en/stable/releasenotes/8.3.2.html Release NotesVendor Advisory
https://security.gentoo.org/glsa/202211-10 Third Party Advisory
https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1319443 ExploitPatchRelease NotesThird Party Advisory
https://github.com/python-pillow/Pillow/commit/9e08eb8f78fdfd2f476e1b20b7cf38683754866b PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00021.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RNSG6VFXTAROGF7ACYLMAZN
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VKRCL7KKAKOXCVD7M6WC5OK
https://pillow.readthedocs.io/en/stable/releasenotes/8.3.2.html Release NotesVendor Advisory
https://security.gentoo.org/glsa/202211-10 Third Party Advisory
https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1319443 ExploitPatchRelease NotesThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-23437), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.