CVE-2026-55379: Python Pillow

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation. This issue is fixed in version 12.3.0.

Affected products

• Python Pillow: before 12.3.0 (fixed in 12.3.0)

Published 2026-07-06. Last modified 2026-07-07.