CVE-2026-59197

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.

• CWE-190
• CWE-787

• https://github.com/python-pillow/Pillow/commit/cce3bdb867c77a3420261ed1bfdb6b0787ec8fc1Patch
• https://github.com/python-pillow/Pillow/pull/9695Issue Tracking, Patch
• https://github.com/python-pillow/Pillow/releases/tag/12.3.0Release Notes
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmrExploit, Vendor Advisory
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmrExploit, Vendor Advisory

Published

Jul 14, 2026

Last Modified

Jul 21, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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