What is CVE-2026-63623?

CVE-2026-63623 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 5.5/10. Published 2026-08-10.

How severe is CVE-2026-63623?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-63623

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.

Published 2026-08-10 · last modified 2026-08-14.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (2.5th percentile), scored 2026-09-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

access.redhat.com/security/cve/CVE-2026-63623 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-63623?: CVE-2026-63623 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 5.5/10. Published 2026-08-10.
How severe is CVE-2026-63623?: Medium severity. CVSS v3 base score is 5.5 out of 10.