HIGH 7.5

PYSEC-2026-2256

Quick fix

PYSEC-2026-2256 — pillow: upgrade to the fixed version with the command below.

pip install --upgrade 'pillow>=12.3.0'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / pillow

Introduced in: 0 Fixed in: 12.3.0

Fix pip install --upgrade 'pillow>=12.3.0'

References

https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst [ADVISORY]
https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675 [FIX]
https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm [EVIDENCE]