Vulnerability record · CVE-2026-59205 · published 14 July 2026

CVE-2026-59205: Python pillow out-of-bounds write vulnerability

Python · Pillow

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption when the caller supplies an output image whose mode does not match the transform's declared output mode. This issue is fixed in version 12.3.0.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.7% CWE-787 · Out-of-bounds write

7.5CVSS 3.1 base score

0.66%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

5References, 2 tagged exploit

14 Jul 2026Last modified by NVD

Description

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

Affected products

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

Pillow Python

References

Link	Tags
https://github.com/python-pillow/Pillow/commit/a9ffc42bedf4fc0a7ef8d6486e7f9e81e3397721	Patch
https://github.com/python-pillow/Pillow/pull/9715	Issue TrackingPatch
https://github.com/python-pillow/Pillow/releases/tag/12.3.0	Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-9hw9-ch79-4vh6	ExploitVendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-9hw9-ch79-4vh6	ExploitVendor Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2026-59205), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.