PYSEC-2026-2256

vendorUSosv

view advisory published 2026-07-06Licence: CC-BY-4.0

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-55380US	—	0.52% (44th)	—	2026-07-06
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 calli…

references

External citations — patches, advisories, analysis.

https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstADVISORY
https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675FIX
https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pmEVIDENCE

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