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CVE-2026-54060

High

Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assembled per-glyph images into a combined bitmap with Image.new("1", (xsize, ysize)) without calling Image._decompression_bomb_check(), allowing a font to trigger excessive allocation during conversion or saving. This issue is fixed in version 12.3.0.

SeverityHigh
CVSS7.5
Exploit probability—
ProductPython 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

ProductAffected versionsFixed in
python pillowv < 12.3.012.3.0
pillowPyPIv < 12.3.012.3.0

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