CVE-2026-55380

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

Configuration 1 (hide)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*

History

25 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Pillow es una biblioteca de imágenes de Python. Antes de la versión 12.3.0, PIL/GdImageFile.py GdImageFile._open() leía las dimensiones de la imagen del encabezado GD 2.x y las almacenaba en self._size sin llamar a Image._decompression_bomb_check(), lo que permitía que un archivo .gd manipulado desencadenara una asignación excesiva de memoria C-heap al cargarse. Este problema está solucionado en la versión 12.3.0.

Information

Published : 2026-07-06 19:17

Updated : 2026-10-25 20:10

NVD link : CVE-2026-55380

Mitre link : CVE-2026-55380

CVE.ORG link : CVE-2026-55380

JSON object : View

Products Affected

python

pillow

CWE

CWE-789

Memory Allocation with Excessive Size Value

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