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: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibvirt0-hwe (12.0.0-1ubuntu5.5) @ resolute2026-10-05ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libvirt10.0.0-1 ... 9.9.0-1 (71 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libvirt11.3.0-3, 11.3.0-3+deb13u1, 11.3.0-3+deb13u2
  • every version up to 11.3.0-3+deb13u3: fixed in 11.3.0-3+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libvirt11.10.0-1 ... 12.5.0-1 (17 versions)
  • every version up to 12.6.0-1: fixed in 12.6.0-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 17× in last 7d / 85× 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 166 total refreshes for this CVE.

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

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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 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 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63623?
CVE-2026-63623 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63623?
A fix for CVE-2026-63623 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63623 are linked in the Vendor Advisories panel on this page.

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