CVE-2026-18917

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-20. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
Patch available. Sources: redhat.
redhat

2520161 – (CVE-2026-18917) CVE-2026-18917 libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow

https://bugzilla.redhat.com/show_bug.cgi?id=2520161
redhat Patch Available

CVE-2026-18917 - 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-2026-18917

Vendor Advisories for CVE-2026-18917(1)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibvirt-0:10.10.0-7.19.el9_62026-09-17redhat
redhatlibvirt-0:10.10.0-8.12.el10_02026-09-17redhat
redhatvirt:rhel-8080020260910092120.63b345852026-09-17redhat
redhatlibvirt-0:9.0.0-10.17.el9_22026-09-17redhat
redhatlibvirt-0:10.0.0-6.24.el9_42026-09-17redhat
redhatvirt:rhel-8060020260910092451.ad008a3a2026-09-17redhat

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 rangeFixed inDependents
libvirt10.0.0-1 ... 9.9.0-1 (71 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libvirt11.10.0-1 ... 12.7.0-1 (22 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libvirt11.10.0-1 ... 12.6.0-1 (18 versions)12.7.0-1—

Weakness Classification(1)

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

All Vendor Advisories

(7)

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 49× in last 7d / 134× 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 147 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2026:68513

Frequently asked(5)

What is CVE-2026-18917?
CVE-2026-18917 is a high vulnerability published on August 20, 2026. A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer.…
When was CVE-2026-18917 disclosed?
CVE-2026-18917 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18917 actively exploited?
CVE-2026-18917 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 93.3% of all scored CVEs.
What is the CVSS score of CVE-2026-18917?
CVE-2026-18917 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-18917?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18917, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18917

Explore →

Is Your Infrastructure Affected by CVE-2026-18917?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs