PT-2026-55965 · Python Pillow · Pillow

X-Forwarded-Sudo · Published 2026-07-06 · Updated 2026-07-06 · CVE-2026-55380

Mitre

CVSS v3.1

7.5

High

Base vector

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

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.

Exploit

Fix

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-55380

Affected Products

Pillow

References · 4

• 🔥 https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-55380 · Security Note
• https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst · Note
• https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675 · Note