CVE-2026-96643
Medium
Description
Pillow is a Python imaging library. From 11.0.0 until 13.0.0, Exif.load() in src/PIL/Image.py repeatedly slices the remaining EXIF data while it begins with the six-byte Exif header. src/PIL/PngImagePlugin.py accepts an uncapped PNG eXIf chunk, so a file filled with repeated headers causes a new shrinking copy on every iteration and quadratic CPU work. The condition is reachable through Image.getexif(), Image._getexif(), and ImageOps.exif_transpose(), including common photo-upload rotation workflows. This issue is fixed in version 13.0.0.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Python Pillow
PublishedOct 21, 2026
First seenOct 21, 2026
Weakness typeCWE-407CWE-407
How to fix
Update
- python pillow13.0.0 or later
- pillow13.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | 11.0.0 ≤ v < 13.0.0 | 13.0.0 |
| pillowPyPI | 11.0.0 ≤ v < 13.0.0 | 13.0.0 |
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