CVE-2026-59197

HighCVSS 8.2/10Last modified Oct 24, 2026

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.

Metrics

CVSS 3.1 8.2/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Weakness enumeration

CWE-190 CWE-787

Affected software

No affected versions have been published.

Timeline

Published: Jul 14, 2026
Last modified: Oct 24, 2026
NVD status: Modified

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