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CVE-2026-56002

libXfont2 PCF Font Parsing Heap Buffer Overflow

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.

CVSS 3.1 · 8.5 High EPSS < 1% KEV · Not listed
Vendors
X X.org
Products
Libxfont Libxfont Libxfont2
CVE-2026-56003

libXfont2 computeProps Property Buffer Heap Buffer Overflow

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.

CVSS 3.1 · 8.5 High EPSS < 1% KEV · Not listed
Vendors
X X.org
Products
Libxfont Libxfont Libxfont2