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: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 20, 2026

Last Modified

October 5, 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(12)

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

Patch Availability(11)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibvirt0-hwe (12.0.0-1ubuntu5.5) @ resolute2026-10-05ubuntu
ubuntulibvirt0 (12.0.0-1ubuntu5.5) @ resolute2026-10-05ubuntu
redhatlibvirt-0:11.10.0-12.7.el9_82026-10-02redhat
redhatvirt:rhel-8040020260916092751.522a0ee42026-09-21redhat
redhatlibvirt-0:4.5.0-36.el7_9.72026-09-21redhat
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
redhatlibvirt-0:10.10.0-7.19.el9_62026-09-17redhat
redhatlibvirt-0:10.10.0-8.12.el10_02026-09-17redhat

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 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 ... 12.6.0-1 (18 versions)
  • every version up to 12.7.0-1: fixed in 12.7.0-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 45× in last 7d / 167× 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 232 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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redhat:RHSA-2026:68513 · ubuntu:USN-8831-1 · ubuntu:USN-8833-1

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 on August 20, 2026, with the most recent update on October 5, 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 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18917?
CVE-2026-18917 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18917?
A fix for CVE-2026-18917 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18917 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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