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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/python-pillow/Pillow/commit/cce3bdb867c77a3420261ed1bfdb6b0787ec8fc1	Patch
https://github.com/python-pillow/Pillow/pull/9695	Issue Tracking Patch
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	Exploit Vendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-14 17:17

Updated : 2026-07-21 19:17

NVD link : CVE-2026-59197

Mitre link : CVE-2026-59197

CVE.ORG link : CVE-2026-59197

JSON object : View

Products Affected

python

pillow

CWE

CWE-190

Integer Overflow or Wraparound

CWE-787

Out-of-bounds Write

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