CVE-2026-55379
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Python Pillow
PublishedJul 6, 2026
First seenJul 6, 2026
Weakness typeCWE-789CWE-789
How to fix
Update
- python pillow12.3.0 or later
- pillow12.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | v < 12.3.0 | 12.3.0 |
| pillowPyPI | v < 12.3.0 | 12.3.0 |
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