What is CVE-2026-54060?

CVE-2026-54060 is a high-severity vulnerability in Python Pillow, classified under CWE-789. CVSS score: 7.5/10. Published 2026-07-06.

How severe is CVE-2026-54060?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Python Pillow

CVE-2026-54060

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.

Published 2026-07-06 · last modified 2026-07-07.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.1th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Python Pillow
Python-Pillow Pillow — versions < 12.3.0

Weakness classification (CWE)

CWE-789

References

github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst (Release Notes)
github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d (Patch)
github.com/python-pillow/Pillow/security/advisories/GHSA-5x94-69rx-g8h2 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-54060?: CVE-2026-54060 is a high-severity vulnerability in Python Pillow, classified under CWE-789. CVSS score: 7.5/10. Published 2026-07-06.
How severe is CVE-2026-54060?: High severity. CVSS v3 base score is 7.5 out of 10.