PYSEC-2026-2254

At a glance

Published: 2026-07-06
Updated: 2026-07-13
CVE: CVE-2026-54060
Aliases: BIT-pillow-2026-54060, GHSA-5x94-69rx-g8h2
CVSS_V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Affected packages

Package	Versions
PyPI · pillow	introduced 0, fixed 12.3.0

References

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

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — PyPA Advisory Database