CVE-2026-16816

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. A secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.9Exploit: 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 remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.

CVSS v3
9.9
EG Score
9.9CRITICALmedium confidence
EG Risk
45
EG Risk 45/100CISA 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
Severity99% × 45%
Exploitation1% × 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
0.8%
EPSS %ILE
54th
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 19, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Oct 1, 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-2026-16816(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 41× in last 7d / 204× 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 351 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16816?
CVE-2026-16816 is a critical vulnerability published on August 19, 2026. IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.
When was CVE-2026-16816 disclosed?
CVE-2026-16816 was first published on August 19, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16816 actively exploited?
CVE-2026-16816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16816?
CVE-2026-16816 has a CVSS base score of 9.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16816?
A fix for CVE-2026-16816 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-16816 are linked in the Vendor Advisories panel on this page.

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