CVE-2026-63623

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM 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 — 4 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(medium)
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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libvirt10.0.0-1 ... 9.9.0-1 (70 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libvirt11.10.0-1 ... 12.6.0-1 (20 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libvirt11.10.0-1 ... 12.5.0-1 (17 versions)12.6.0-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 22× in last 7d / 99× 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.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-09-20 20:06 UTCVendor advisory
  2. 2026-09-20 20:06 UTCGHSA enrichment
  3. 2026-09-19 21:35 UTCEG score recompute
  4. 2026-09-19 21:35 UTCVendor advisory
  5. 2026-09-19 21:35 UTCGHSA enrichment
  6. 2026-09-18 23:12 UTCEG score recompute
  7. 2026-09-18 23:12 UTCVendor advisory
  8. 2026-09-18 23:12 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 00:49 UTCEG score recompute
  11. 2026-09-18 00:49 UTCVendor advisory
  12. 2026-09-18 00:49 UTCGHSA enrichment
  13. 2026-09-17 00:54 UTCEG score recompute
  14. 2026-09-17 00:54 UTCVendor advisory
  15. 2026-09-17 00:54 UTCGHSA enrichment
  16. 2026-09-16 14:08 UTCEPSS rescore
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-16 02:31 UTCEG score recompute
  19. 2026-09-16 02:31 UTCVendor advisory
  20. 2026-09-16 02:31 UTCGHSA enrichment
  21. 2026-09-15 00:28 UTCVendor advisory
  22. 2026-09-15 00:28 UTCGHSA enrichment
  23. 2026-09-13 21:51 UTCVendor advisory
  24. 2026-09-13 21:51 UTCGHSA enrichment
  25. 2026-09-12 23:28 UTCEG score recompute
Show 75 more
  1. 2026-09-12 23:28 UTCVendor advisory
  2. 2026-09-12 23:28 UTCGHSA enrichment
  3. 2026-09-12 01:05 UTCEG score recompute
  4. 2026-09-12 01:05 UTCVendor advisory
  5. 2026-09-12 01:05 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 09:37 UTCEPSS rescore
  8. 2026-09-11 02:42 UTCEG score recompute
  9. 2026-09-11 02:42 UTCGHSA enrichment
  10. 2026-09-10 04:19 UTCEG score recompute
  11. 2026-09-10 04:19 UTCGHSA enrichment
  12. 2026-09-09 05:51 UTCEG score recompute
  13. 2026-09-09 05:51 UTCVendor advisory
  14. 2026-09-09 05:51 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-07 17:16 UTCEG score recompute
  17. 2026-09-07 17:16 UTCVendor advisory
  18. 2026-09-07 17:16 UTCGHSA enrichment
  19. 2026-09-07 16:01 UTCEPSS rescore
  20. 2026-09-06 13:47 UTCEPSS rescore
  21. 2026-09-06 05:10 UTCEG score recompute
  22. 2026-09-06 05:10 UTCVendor advisory
  23. 2026-09-06 05:10 UTCGHSA enrichment
  24. 2026-09-05 15:31 UTCEPSS rescore
  25. 2026-09-05 06:48 UTCEG score recompute
  26. 2026-09-05 06:48 UTCVendor advisory
  27. 2026-09-05 06:48 UTCGHSA enrichment
  28. 2026-09-04 08:22 UTCEG score recompute
  29. 2026-09-04 08:22 UTCVendor advisory
  30. 2026-09-04 08:22 UTCGHSA enrichment
  31. 2026-09-04 05:07 UTCEPSS rescore
  32. 2026-09-03 05:58 UTCEG score recompute
  33. 2026-09-03 05:58 UTCVendor advisory
  34. 2026-09-03 05:58 UTCGHSA enrichment
  35. 2026-09-02 14:12 UTCEPSS rescore
  36. 2026-09-02 06:25 UTCEG score recompute
  37. 2026-09-02 06:25 UTCVendor advisory
  38. 2026-09-02 06:25 UTCGHSA enrichment
  39. 2026-09-01 13:54 UTCEPSS rescore
  40. 2026-09-01 07:05 UTCVendor advisory
  41. 2026-09-01 07:04 UTCGHSA enrichment
  42. 2026-08-31 06:48 UTCEG score recompute
  43. 2026-08-31 06:48 UTCVendor advisory
  44. 2026-08-31 06:47 UTCGHSA enrichment
  45. 2026-08-30 19:17 UTCEPSS rescore
  46. 2026-08-30 08:24 UTCEG score recompute
  47. 2026-08-30 08:24 UTCVendor advisory
  48. 2026-08-30 08:24 UTCGHSA enrichment
  49. 2026-08-30 01:22 UTCEPSS rescore
  50. 2026-08-29 09:56 UTCEG score recompute
  51. 2026-08-29 09:56 UTCVendor advisory
  52. 2026-08-29 09:56 UTCGHSA enrichment
  53. 2026-08-28 21:42 UTCEPSS rescore
  54. 2026-08-27 20:43 UTCEG score recompute
  55. 2026-08-27 20:43 UTCVendor advisory
  56. 2026-08-27 20:43 UTCGHSA enrichment
  57. 2026-08-27 14:25 UTCEPSS rescore
  58. 2026-08-26 22:21 UTCEG score recompute
  59. 2026-08-26 22:21 UTCVendor advisory
  60. 2026-08-26 22:20 UTCGHSA enrichment
  61. 2026-08-26 14:46 UTCEPSS rescore
  62. 2026-08-25 23:57 UTCEG score recompute
  63. 2026-08-25 23:57 UTCVendor advisory
  64. 2026-08-25 23:57 UTCGHSA enrichment
  65. 2026-08-25 13:49 UTCEPSS rescore
  66. 2026-08-25 01:34 UTCEG score recompute
  67. 2026-08-25 01:34 UTCVendor advisory
  68. 2026-08-25 01:34 UTCGHSA enrichment
  69. 2026-08-24 03:11 UTCGHSA enrichment
  70. 2026-08-23 04:46 UTCEG score recompute
  71. 2026-08-23 04:46 UTCGHSA enrichment
  72. 2026-08-23 00:19 UTCEPSS rescore
  73. 2026-08-22 06:24 UTCEG score recompute
  74. 2026-08-22 06:24 UTCGHSA enrichment
  75. 2026-08-21 23:49 UTCEPSS rescore

Related CVEs(same CWE)

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

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