CVE-2026-96643
Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-407 |
| Vendor | python-pillow |
| Product | pillow |
| Published | Oct 21, 2026 |
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Affected Versions
python-pillow / Pillow
>= 11.0.0, < 13.0.0
References
github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-g4qv-2jxx-769h github.com: https://github.com/python-pillow/Pillow/pull/10073 github.com: https://github.com/python-pillow/Pillow/commit/806e38381c781f32bbd22f4cd026678acd40fd6c github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0