CVE-2026-55380

Pillow GdImageFile decompression bomb protection bypass

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.

Affected

python-pillow · Pillow

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-07-06

Proof-of-concept exploits (1)

• advisories/GHSA-phj9-mv4w-65pm

Security advisories

• python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm
• python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675

References

• CVE Record
• NVD entry