Is CVE-2026-63623 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63623?

CVE-2026-63623 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-63623

Description

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the `qemu-img` utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.