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Vulnerability record · CVE-2026-59197 · published 14 July 2026

CVE-2026-59197: Python pillow integer overflow vulnerability

Python · Pillow

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.

8.2 CVSS 3.1 High EPSS 0.58% · top 54.4% CWE-190 · Integer overflowCWE-787 · Out-of-bounds write
8.2CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
21 Jul 2026Last modified by NVD

Description

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.

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

Affected products

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

References

LinkTags
https://github.com/python-pillow/Pillow/commit/cce3bdb867c77a3420261ed1bfdb6b0787ec8fc1 Patch
https://github.com/python-pillow/Pillow/pull/9695 Issue TrackingPatch
https://github.com/python-pillow/Pillow/releases/tag/12.3.0 Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr ExploitVendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr 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-2026-59197), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.