5.5

CVE-2026-63623: libvirt

CVSS: 5.5v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-63623DEBIAN-CVE-2026-63623
Published 10-08-2026Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2026-63623 is a medium (CVSS 5.5) vulnerability in libvirt. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.6% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.10%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 13
OPENSUSE-SU-2026:11455-1OPENSUSE-SU-2026:21738-1SUSE-SU-2026:23445-1SUSE-SU-2026:23460-1SUSE-SU-2026:23515-1SUSE-SU-2026:23603-1

Timeline

  1. 10-08-2026
    PublishedVulnerability first disclosed.
  2. 10-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.10%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

0.00 pp

From 0.10% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu2 products
  • libvirt< 1.2.2-0ubuntu13.1.28+esm2 | < 1.3.1-1ubuntu10.31+esm1 | < 4.0.0-1ubuntu8.21+esm1 | < 6.0.0-0ubuntu8.20+esm1 | < 8.0.0-1ubuntu7.19 | < 10.0.0-2ubuntu8.16 | < 12.0.0-1ubuntu5.3
  • libvirt-hwe< 12.0.0-1ubuntu5.5
Debian1 product
  • libvirtAll versions (No fix recorded) | < 11.3.0-3+deb13u3 | < 12.6.0-1

2 vendors · 3 products

References

8 links