The vulnerability in the _load_bitmaps() function of the PIL/PcfFontFile.py file from the Pillow image processing library allows a attacker to cause a denial-of-service attack.

The vulnerability of the loadbitmaps function in the PIL/PcfFontFile.py file from the Python Pillow image processing library is related to uncontrolled memory allocation. Exploiting this vulnerability could allow an attacker to cause a service failure...

CVE-2026-54059: Memory Allocation with Excessive Size Value

Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py loadbitmaps read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes without calling Image.decompressionbombcheck, allowing crafted PCF font data to cause excessive memory allocation. Thi...