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CVE-2026-96643

Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
python-pillow / Pillowaffected >= 11.0.0, < 13.0.0

CWE

CWE-407

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.