CVE-2026-18840

HIGHNVD 7.88.2▲
EchelonGraph scoreHIGH 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 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

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
8.2(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 20, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
No patch 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 26× in last 7d / 125× 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 125 total refreshes for this CVE.

  1. 2026-09-19 10:09 UTCGHSA enrichment
  2. 2026-09-18 22:27 UTCEG score recompute
  3. 2026-09-18 22:27 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 11:22 UTCGHSA enrichment
  6. 2026-09-18 00:16 UTCEG score recompute
  7. 2026-09-18 00:16 UTCGHSA enrichment
  8. 2026-09-17 13:10 UTCGHSA enrichment
  9. 2026-09-17 01:27 UTCGHSA enrichment
  10. 2026-09-16 14:21 UTCEG score recompute
  11. 2026-09-16 14:21 UTCGHSA enrichment
  12. 2026-09-16 14:07 UTCEPSS rescore
  13. 2026-09-16 05:14 UTCEPSS rescore
  14. 2026-09-16 02:19 UTCGHSA enrichment
  15. 2026-09-15 15:13 UTCGHSA enrichment
  16. 2026-09-15 03:47 UTCEG score recompute
  17. 2026-09-15 03:47 UTCGHSA enrichment
  18. 2026-09-14 16:41 UTCGHSA enrichment
  19. 2026-09-14 05:35 UTCGHSA enrichment
  20. 2026-09-13 18:30 UTCEG score recompute
  21. 2026-09-13 18:30 UTCGHSA enrichment
  22. 2026-09-13 16:46 UTCEPSS rescore
  23. 2026-09-13 07:24 UTCGHSA enrichment
  24. 2026-09-12 20:19 UTCEG score recompute
  25. 2026-09-12 20:19 UTCGHSA enrichment
Show 75 more
  1. 2026-09-12 15:00 UTCEPSS rescore
  2. 2026-09-12 09:13 UTCGHSA enrichment
  3. 2026-09-11 22:07 UTCEG score recompute
  4. 2026-09-11 22:07 UTCGHSA enrichment
  5. 2026-09-11 14:52 UTCEPSS rescore
  6. 2026-09-11 11:01 UTCEG score recompute
  7. 2026-09-11 11:01 UTCGHSA enrichment
  8. 2026-09-11 09:36 UTCEPSS rescore
  9. 2026-09-10 23:19 UTCGHSA enrichment
  10. 2026-09-10 12:13 UTCEG score recompute
  11. 2026-09-10 12:13 UTCGHSA enrichment
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-10 00:47 UTCGHSA enrichment
  14. 2026-09-09 12:59 UTCGHSA enrichment
  15. 2026-09-09 01:50 UTCEG score recompute
  16. 2026-09-09 01:50 UTCGHSA enrichment
  17. 2026-09-08 22:00 UTCEPSS rescore
  18. 2026-09-08 06:24 UTCGHSA enrichment
  19. 2026-09-07 19:17 UTCEG score recompute
  20. 2026-09-07 19:17 UTCGHSA enrichment
  21. 2026-09-07 16:01 UTCEPSS rescore
  22. 2026-09-07 08:10 UTCGHSA enrichment
  23. 2026-09-06 20:46 UTCEG score recompute
  24. 2026-09-06 20:46 UTCGHSA enrichment
  25. 2026-09-06 13:47 UTCEPSS rescore
  26. 2026-09-06 09:40 UTCGHSA enrichment
  27. 2026-09-05 22:34 UTCEG score recompute
  28. 2026-09-05 22:34 UTCGHSA enrichment
  29. 2026-09-05 11:29 UTCGHSA enrichment
  30. 2026-09-05 00:22 UTCEG score recompute
  31. 2026-09-05 00:22 UTCGHSA enrichment
  32. 2026-09-04 13:15 UTCEG score recompute
  33. 2026-09-04 13:15 UTCGHSA enrichment
  34. 2026-09-04 05:06 UTCEPSS rescore
  35. 2026-09-04 02:09 UTCGHSA enrichment
  36. 2026-09-03 15:01 UTCGHSA enrichment
  37. 2026-09-03 03:51 UTCGHSA enrichment
  38. 2026-09-02 16:46 UTCGHSA enrichment
  39. 2026-09-02 05:40 UTCGHSA enrichment
  40. 2026-09-01 18:30 UTCEG score recompute
  41. 2026-09-01 18:30 UTCGHSA enrichment
  42. 2026-09-01 13:53 UTCEPSS rescore
  43. 2026-09-01 07:22 UTCEG score recompute
  44. 2026-09-01 07:21 UTCGHSA enrichment
  45. 2026-09-01 04:39 UTCEPSS rescore
  46. 2026-08-31 20:14 UTCGHSA enrichment
  47. 2026-08-31 09:09 UTCGHSA enrichment
  48. 2026-08-30 21:59 UTCEG score recompute
  49. 2026-08-30 21:59 UTCGHSA enrichment
  50. 2026-08-30 19:17 UTCEPSS rescore
  51. 2026-08-30 10:53 UTCEG score recompute
  52. 2026-08-30 10:53 UTCGHSA enrichment
  53. 2026-08-30 01:22 UTCEPSS rescore
  54. 2026-08-29 23:47 UTCGHSA enrichment
  55. 2026-08-29 12:41 UTCGHSA enrichment
  56. 2026-08-29 01:34 UTCEG score recompute
  57. 2026-08-29 01:33 UTCGHSA enrichment
  58. 2026-08-28 21:41 UTCEPSS rescore
  59. 2026-08-28 14:25 UTCGHSA enrichment
  60. 2026-08-28 03:15 UTCGHSA enrichment
  61. 2026-08-27 16:09 UTCEG score recompute
  62. 2026-08-27 16:09 UTCGHSA enrichment
  63. 2026-08-27 14:25 UTCEPSS rescore
  64. 2026-08-27 04:59 UTCGHSA enrichment
  65. 2026-08-26 17:53 UTCEG score recompute
  66. 2026-08-26 17:53 UTCGHSA enrichment
  67. 2026-08-26 14:46 UTCEPSS rescore
  68. 2026-08-26 05:44 UTCGHSA enrichment
  69. 2026-08-25 18:38 UTCEG score recompute
  70. 2026-08-25 18:38 UTCGHSA enrichment
  71. 2026-08-25 18:38 UTCNVD updateCVSS v3 → 7.8
  72. 2026-08-25 15:09 UTCEG score recompute
  73. 2026-08-25 15:09 UTCGHSA enrichment
  74. 2026-08-25 13:48 UTCEPSS rescore
  75. 2026-08-25 04:03 UTCGHSA enrichment

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 97.6% of all 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.
How do I remediate CVE-2026-18840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18840, 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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