CVE-2026-18842

HIGHNVD 7.88.4▲
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-21. NVD baseline CVSS 7.8; sources differ by 0.6.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious 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 available — apply it.

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to an out-of-bounds write.

CVSS v3
7.8
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity84% × 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
0.1%
EPSS %ILE
1st
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

August 25, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
Patch available.
generic

Security Bulletin: Vulnerabilities in IBM AIX and PowerVM VIOS

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

Vendor Advisories for CVE-2026-18842(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 22× in last 7d / 102× 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 13:51 UTCGHSA enrichment
  2. 2026-10-05 02:34 UTCEG score recompute
  3. 2026-10-05 02:34 UTCGHSA enrichment
  4. 2026-10-04 23:21 UTCEPSS rescore
  5. 2026-10-04 15:39 UTCGHSA enrichment
  6. 2026-10-04 04:23 UTCGHSA enrichment
  7. 2026-10-03 17:28 UTCEG score recompute
  8. 2026-10-03 17:28 UTCGHSA enrichment
  9. 2026-10-03 06:34 UTCGHSA enrichment
  10. 2026-10-02 19:17 UTCEG score recompute
  11. 2026-10-02 19:17 UTCGHSA enrichment
  12. 2026-10-02 08:21 UTCGHSA enrichment
  13. 2026-10-01 21:26 UTCEG score recompute
  14. 2026-10-01 21:26 UTCGHSA enrichment
  15. 2026-10-01 19:49 UTCEPSS rescore
  16. 2026-10-01 07:24 UTCGHSA enrichment
  17. 2026-09-30 20:29 UTCEG score recompute
  18. 2026-09-30 20:29 UTCGHSA enrichment
  19. 2026-09-30 15:02 UTCEPSS rescore
  20. 2026-09-30 08:03 UTCGHSA enrichment
  21. 2026-09-28 23:57 UTCEG score recompute
  22. 2026-09-28 23:57 UTCGHSA enrichment
  23. 2026-09-28 13:51 UTCEPSS rescore
  24. 2026-09-28 12:54 UTCGHSA enrichment
  25. 2026-09-28 01:59 UTCGHSA enrichment
Show 75 more
  1. 2026-09-27 14:47 UTCEG score recompute
  2. 2026-09-27 14:47 UTCGHSA enrichment
  3. 2026-09-27 13:47 UTCEPSS rescore
  4. 2026-09-27 02:47 UTCEG score recompute
  5. 2026-09-27 02:47 UTCGHSA enrichment
  6. 2026-09-26 15:58 UTCEPSS rescore
  7. 2026-09-25 17:18 UTCGHSA enrichment
  8. 2026-09-25 05:58 UTCGHSA enrichment
  9. 2026-09-24 19:03 UTCEG score recompute
  10. 2026-09-24 19:03 UTCGHSA enrichment
  11. 2026-09-24 06:58 UTCGHSA enrichment
  12. 2026-09-23 20:02 UTCEG score recompute
  13. 2026-09-23 20:02 UTCGHSA enrichment
  14. 2026-09-23 08:33 UTCGHSA enrichment
  15. 2026-09-22 21:37 UTCEG score recompute
  16. 2026-09-22 21:37 UTCGHSA enrichment
  17. 2026-09-22 10:42 UTCGHSA enrichment
  18. 2026-09-21 23:39 UTCEG score recompute
  19. 2026-09-21 23:39 UTCGHSA enrichment
  20. 2026-09-21 12:43 UTCGHSA enrichment
  21. 2026-09-21 01:48 UTCGHSA enrichment
  22. 2026-09-20 14:53 UTCGHSA enrichment
  23. 2026-09-20 03:59 UTCEG score recompute
  24. 2026-09-20 03:59 UTCGHSA enrichment
  25. 2026-09-19 17:03 UTCGHSA enrichment
  26. 2026-09-19 06:07 UTCEG score recompute
  27. 2026-09-19 06:06 UTCGHSA enrichment
  28. 2026-09-18 19:27 UTCEPSS rescore
  29. 2026-09-18 19:11 UTCGHSA enrichment
  30. 2026-09-18 08:12 UTCGHSA enrichment
  31. 2026-09-17 21:17 UTCEG score recompute
  32. 2026-09-17 21:17 UTCGHSA enrichment
  33. 2026-09-17 08:37 UTCGHSA enrichment
  34. 2026-09-16 21:42 UTCEG score recompute
  35. 2026-09-16 21:42 UTCGHSA enrichment
  36. 2026-09-16 14:07 UTCEPSS rescore
  37. 2026-09-16 10:46 UTCEG score recompute
  38. 2026-09-16 10:46 UTCGHSA enrichment
  39. 2026-09-16 05:14 UTCEPSS rescore
  40. 2026-09-15 23:39 UTCGHSA enrichment
  41. 2026-09-15 12:26 UTCEG score recompute
  42. 2026-09-15 12:26 UTCGHSA enrichment
  43. 2026-09-15 01:30 UTCGHSA enrichment
  44. 2026-09-14 14:35 UTCGHSA enrichment
  45. 2026-09-14 03:39 UTCEG score recompute
  46. 2026-09-14 03:39 UTCGHSA enrichment
  47. 2026-09-13 16:46 UTCEPSS rescore
  48. 2026-09-13 16:45 UTCGHSA enrichment
  49. 2026-09-13 05:50 UTCGHSA enrichment
  50. 2026-09-12 18:55 UTCEG score recompute
  51. 2026-09-12 18:55 UTCGHSA enrichment
  52. 2026-09-12 15:00 UTCEPSS rescore
  53. 2026-09-12 08:01 UTCGHSA enrichment
  54. 2026-09-11 21:06 UTCEG score recompute
  55. 2026-09-11 21:06 UTCGHSA enrichment
  56. 2026-09-11 14:52 UTCEPSS rescore
  57. 2026-09-11 10:11 UTCGHSA enrichment
  58. 2026-09-10 23:14 UTCGHSA enrichment
  59. 2026-09-10 12:13 UTCEG score recompute
  60. 2026-09-10 12:13 UTCGHSA enrichment
  61. 2026-09-10 09:34 UTCEPSS rescore
  62. 2026-09-10 00:47 UTCGHSA enrichment
  63. 2026-09-09 12:59 UTCGHSA enrichment
  64. 2026-09-09 01:51 UTCEG score recompute
  65. 2026-09-09 01:50 UTCGHSA enrichment
  66. 2026-09-08 22:00 UTCEPSS rescore
  67. 2026-09-08 04:24 UTCGHSA enrichment
  68. 2026-09-07 17:29 UTCEG score recompute
  69. 2026-09-07 17:29 UTCGHSA enrichment
  70. 2026-09-07 16:01 UTCEPSS rescore
  71. 2026-09-07 06:35 UTCGHSA enrichment
  72. 2026-09-06 19:33 UTCEG score recompute
  73. 2026-09-06 19:32 UTCGHSA enrichment
  74. 2026-09-06 13:47 UTCEPSS rescore
  75. 2026-09-06 08:35 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18842?
CVE-2026-18842 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 gain elevated privileges due to an out-of-bounds write.
When was CVE-2026-18842 disclosed?
CVE-2026-18842 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-2026-18842 actively exploited?
CVE-2026-18842 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-2026-18842?
CVE-2026-18842 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.4 (HIGH).
How do I remediate CVE-2026-18842?
A fix for CVE-2026-18842 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18842 are linked in the Vendor Advisories panel on this page.

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