Is CVE-2026-63623 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-63623 being exploited in the wild.

How severe is CVE-2026-63623?

Medium severity, with a CVSS score of 5.5, published 10 August 2026.

Is there a fix for CVE-2026-63623?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-63623 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-63623?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-63623: libvirt world-readable storage volume images during clone/convert

CVE-2026-63623 · Severity: medium · CVSS 5.5 · Published 2026-08-10

libvirt is virtualization management software that handles storage operations for virtual machines. During storage volume cloning or conversion operations, newly created disk images were temporarily readable by any local user on the system, potentially exposing sensitive guest data. This could allow unauthorized access to confidential information stored within virtual machines.

Quick answers

Is CVE-2026-63623 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-63623 being exploited in the wild.
How severe is CVE-2026-63623?: Medium severity, with a CVSS score of 5.5, published 10 August 2026.
Which products and versions are affected?: libvirt.org libvirt <UNKNOWN>.
Is there a fix for CVE-2026-63623?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-63623 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-63623?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A permission assignment vulnerability (CWE-732) in libvirt's storage volume clone and convert operations caused newly created volume images to be world-readable. The root cause is overly permissive file creation settings in the qemu-img utility when run by libvirt. An attacker with local system access can exploit this during the brief window when the volume is being created to read the full contents of guest disk images, leading to information disclosure. The vulnerability requires local access and low privileges. A patch is available through Red Hat updates.

Affected products

libvirt.org libvirt <UNKNOWN>

Timeline

2026-08-10: disclosed
2026-08-10: advisory

References

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