CVE-2026-59197
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
Product
Python Pillow
PublishedJul 14, 2026
First seenJul 14, 2026
Weakness typeCWE-787Out-of-bounds writeCWE-190Integer overflow
How to fix
Update
- python pillow12.3.0 or later
- pillow12.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | v < 12.3.0 | 12.3.0 |
| pillowPyPI | v < 12.3.0 | 12.3.0 |
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