CVE-2026-16909

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.8Exploit: 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 remote attacker to execute arbitrary code due to an off-by-one error in bounds checking.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 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
0.4%
EPSS %ILE
33rd
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 19, 2026

Last Modified

August 21, 2026

Advisory Details (1)

Auto-updated Aug 19, 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-2026-16909(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 / 99× 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 179 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16909?
CVE-2026-16909 is a high vulnerability published on August 19, 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 an off-by-one error in bounds checking.
When was CVE-2026-16909 disclosed?
CVE-2026-16909 was first published on August 19, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16909 actively exploited?
CVE-2026-16909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16909?
CVE-2026-16909 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16909?
A fix for CVE-2026-16909 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-2026-16909 are linked in the Vendor Advisories panel on this page.

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