CVE-2026-54060 PUBLISHED

Pillow: `FontFile.compile()`: `Image.new()` called without `_decompression_bomb_check()`

Assigner: GitHub_M
Reserved: 11.06.2026 Published: 06.07.2026 Updated: 07.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	python-pillow
Product	Pillow
Versions	Version < 12.3.0 is affected

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-5x94-69rx-g8h2
https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst

Problem Types

CWE-789: Memory Allocation with Excessive Size Value CWE