What is CVE-2026-56001?

CVE-2026-56001 is a high-severity vulnerability in X Libxfont, classified under Heap-based Buffer Overflow. CVSS score: 8.5/10. Published 2026-07-08.

How severe is CVE-2026-56001?

High severity. CVSS v3 base score is 8.5 out of 10.

Buffer overflow in X Libxfont

CVE-2026-56001

A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont

Vulnerability class: Buffer Overflow

EPSS: 0.004 (31.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

X Libxfont
X.org Libxfont2 — versions 0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

meissner@suse.de (Patch, patch)
meissner@suse.de (vendor-advisory, Patch, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-56001?: CVE-2026-56001 is a high-severity vulnerability in X Libxfont, classified under Heap-based Buffer Overflow. CVSS score: 8.5/10. Published 2026-07-08.
How severe is CVE-2026-56001?: High severity. CVSS v3 base score is 8.5 out of 10.