CVE-2026-63623

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-08-10. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.5
EG Score
5.5(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Aug 10, 2026
Patch available. Sources: redhat.
redhat

2513066 – (CVE-2026-63623) CVE-2026-63623 libvirt: Information disclosure via world-readable storage volume images during clone/convert

https://bugzilla.redhat.com/show_bug.cgi?id=2513066
redhat Patch Available

CVE-2026-63623 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-63623

Vendor Advisories for CVE-2026-63623(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 08:01 UTCEG score recompute
  2. 2026-08-21 08:01 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 09:38 UTCGHSA enrichment
  5. 2026-08-19 11:16 UTCEG score recompute
  6. 2026-08-19 11:16 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-18 12:50 UTCGHSA enrichment
  9. 2026-08-17 14:27 UTCEG score recompute
  10. 2026-08-17 14:27 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 16:04 UTCEG score recompute
  13. 2026-08-16 16:04 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-15 17:42 UTCEG score recompute
  16. 2026-08-15 17:42 UTCGHSA enrichment
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 19:19 UTCGHSA enrichment
  19. 2026-08-14 15:03 UTCGHSA enrichment
  20. 2026-08-13 16:40 UTCGHSA enrichment
  21. 2026-08-12 18:17 UTCGHSA enrichment
  22. 2026-08-11 19:54 UTCEG score recompute
  23. 2026-08-11 19:54 UTCGHSA enrichment
  24. 2026-08-10 21:32 UTCEG score recompute
  25. 2026-08-10 21:32 UTCGHSA enrichment
Show 5 more
  1. 2026-08-10 21:15 UTCEG score recompute
  2. 2026-08-10 21:15 UTCGHSA enrichment
  3. 2026-08-10 17:22 UTCEG score recompute
  4. 2026-08-10 16:50 UTCEG score recompute
  5. 2026-08-10 16:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-63623?
CVE-2026-63623 is a medium vulnerability published on August 10, 2026. 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.…
When was CVE-2026-63623 disclosed?
CVE-2026-63623 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63623 actively exploited?
CVE-2026-63623 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 99.2% of all scored CVEs.
What is the CVSS score of CVE-2026-63623?
CVE-2026-63623 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-63623?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63623, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-63623

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