What is CVE-2026-56003?

CVE-2026-56003 is a high-severity vulnerability in X.org Libxfont2, classified under Heap-based Buffer Overflow. CVSS score: 8.5/10. Published 2026-07-08.

How severe is CVE-2026-56003?

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

Buffer overflow in X.org Libxfont2

CVE-2026-56003

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code…

Vulnerability class: Buffer Overflow

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.org Libxfont2 — versions 0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

meissner@suse.de (vendor-advisory)
meissner@suse.de (patch)

Frequently asked questions

What is CVE-2026-56003?: CVE-2026-56003 is a high-severity vulnerability in X.org Libxfont2, classified under Heap-based Buffer Overflow. CVSS score: 8.5/10. Published 2026-07-08.
How severe is CVE-2026-56003?: High severity. CVSS v3 base score is 8.5 out of 10.