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.
- Score
- CVSS 3.1 8.2 High
- Status
- Modified - security-advisories@github.com
- Published
- 2026-07-14
- Last modified
- 2026-10-24
- Weaknesses
- CWE-190, CWE-787
Affected products
References
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr
- https://github.com/python-pillow/Pillow/pull/9695
- https://github.com/python-pillow/Pillow/commit/cce3bdb867c77a3420261ed1bfdb6b0787ec8fc1
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0
