CVE-2026-18840

HIGHNVD 7.88.2▲
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-21. NVD baseline CVSS 7.8; sources differ by 0.4.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to improper validation of an attacker-controlled pointer.

CVSS v3
7.8
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

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

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

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

August 25, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
Fix referenced — no release confirmed yet.
generic

Security Bulletin: Vulnerabilities in IBM AIX and PowerVM VIOS

https://www.ibm.com/support/pages/node/7283858

Vendor Advisories for CVE-2026-18840(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 23× in last 7d / 104× 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 192 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18840?
CVE-2026-18840 is a high vulnerability published on August 20, 2026. IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to improper validation of an attacker-controlled pointer.
When was CVE-2026-18840 disclosed?
CVE-2026-18840 was first published on August 20, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18840 actively exploited?
CVE-2026-18840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18840?
CVE-2026-18840 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.2 (HIGH).
How do I remediate CVE-2026-18840?
A fix for CVE-2026-18840 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-18840 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18840

Explore →

Is Your Infrastructure Affected by CVE-2026-18840?

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

Book a Demo →Browse All CVEs