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.
| Vendor | Product | Versions |
|---|---|---|
| python software foundation | pillow | >= 11.0.0, < 13.0.0 |
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Updated affected versions to include 12.x and set severity to MEDIUM based on 'problematic' classification.
Initial creation
