CVE-2026-16996

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-21. 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: 0.2%CVSS: 8.8Exploit: 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 local attacker to execute arbitrary code due to an integer underflow.

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: 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
0.2%
EPSS %ILE
5th
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 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-2026-16996(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 98× 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 161 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-16996?
CVE-2026-16996 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 an integer underflow.
When was CVE-2026-16996 disclosed?
CVE-2026-16996 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-2026-16996 actively exploited?
CVE-2026-16996 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16996?
CVE-2026-16996 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-2026-16996?
No fix for CVE-2026-16996 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-2026-16996 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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