Is CVE-2026-105959 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-105959?

CVE-2026-105959 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-105959

Description

A flaw was found in spice-server. The GLZ encoder dictionary restore path truncates a size_t allocation size to int when calling the malloc callback, allowing a malicious authenticated SPICE client during VM live migration to trigger a massive heap buffer overflow by sending a crafted max_encoders value in migration data.