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Vulnerability record · CVE-2021-25288 · published 2 June 2021

CVE-2021-25288: Python pillow out-of-bounds read vulnerability

Python · Pillow

An issue was discovered in Pillow before 8.2.0. There is an out-of-bounds read in J2kDecode, in j2ku_gray_i.

9.1 CVSS 3.1 Critical EPSS 2.4% · top 16.7% CWE-125 · Out-of-bounds read
9.1CVSS 3.1 base score, v2 6.4
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Pillow before 8.2.0. There is an out-of-bounds read in J2kDecode, in j2ku_gray_i.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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/pull/5377#issuecomment-833821470 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-25287-cve-2021-25288-fix-oob-read-in-jpeg2kdeco Vendor Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory
https://github.com/python-pillow/Pillow/pull/5377#issuecomment-833821470 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-25287-cve-2021-25288-fix-oob-read-in-jpeg2kdeco Vendor Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-25288), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.