Is CVE-2026-56003 actively exploited?

No active exploitation of CVE-2026-56003 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-56003 be exploited remotely?

Yes. CVE-2026-56003 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-56003?

CVE-2026-56003 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2026-56003

HIGH

CVE-2026-56003

CWE-122Published: July 8, 2026· Updated: Jul 9, 2026

8.8

CVSS v3.1

EPSS:0.58%probability of exploitation in 30 daysPercentile:43.6th

Official Description

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 within the X server.

NVD Source

Technical Analysis

CVE-2026-56003 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.