CVE-2026-17138

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5% (39th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a stack-based buffer overflow.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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 Sep 29, 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-2026-17138(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 44× in last 7d / 202× 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 311 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-17138?
CVE-2026-17138 is a critical vulnerability published on August 20, 2026. IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a stack-based buffer overflow.
When was CVE-2026-17138 disclosed?
CVE-2026-17138 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-2026-17138 actively exploited?
CVE-2026-17138 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-17138?
CVE-2026-17138 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-17138?
No fix for CVE-2026-17138 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-17138 are linked in the Vendor Advisories panel on this page.

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