CVE-2026-56002

highCVSS 8.5covered by 2 sourcesfirst seen 2026-07-02

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

CSIRTS triage

What: There is a heap buffer overflow in PCF font parsing.
Who is affected: Deployments of libXfont2 are affected.
Urgency: Remediation is urgent due to the high severity and potential for exploitation.
Action: Update to the latest version of libXfont2.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

Advisory coverage (2)

highCVE-2026-56002: A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.…nvd · 2026-07-08
highCVE-2026-56002: libXfont2 PCF Font Parsing Heap Buffer Overflowmsrc · 2026-07-02

External references

NVD record for CVE-2026-56002

CVE.org record

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