The vulnerability of the GdImageFile._open() function in the PIL/GdImageFile.py library for working with images in the Python Pillow library allows a attacker to cause a service denial.

The vulnerability of the GdImageFile.open function in the PIL/GdImageFile.py library for working with images in the Python Pillow library is related to uncontrolled memory allocation. Exploiting this vulnerability could allow a remote attacker to cause a service failure...

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.decompressionbombcheck, allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This iss...

CVE-2026-55380: Memory Allocation with Excessive Size Value

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.decompressionbombcheck, allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This iss...