Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | < 12.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/python-pillow/Pillow/commit/cce3bdb867c77a3420261ed1bfdb6b078Patch
- https://github.com/python-pillow/Pillow/pull/9695Issue TrackingPatch
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmrExploitVendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmrExploitVendor Advisory
FAQ
What is CVE-2026-59197?
CVE-2026-59197 is a vulnerability with a CVSS score of 8.2 (HIGH). 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.RankFilte...
How severe is CVE-2026-59197?
CVE-2026-59197 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59197?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.