Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675 Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · pythonNVD modified 2026-10-25 20:10
Affected (CPE criteria) 1
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
References 4
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst Release Notes
- https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675 Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm Exploit, Vendor Advisory