CVE-2026-16903

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. the CNA's CVSS baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:ibm, epss, ghsa
Trending — 4 sources updated this week
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: None knownExposed: 0

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

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code or cause a denial of service due to an out-of-bounds write.

CVSS v3
9.6
EG Score
9.6(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

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
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 21, 2026

Advisory Details (1)

Auto-updated Aug 19, 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-2026-16903(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 20× in last 7d / 20× 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.

  1. 2026-08-21 04:20 UTCEG score recompute
  2. 2026-08-21 04:20 UTCGHSA enrichment
  3. 2026-08-21 00:30 UTCEG score recompute
  4. 2026-08-21 00:30 UTCGHSA enrichment
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 20:33 UTCGHSA enrichment
  7. 2026-08-20 16:36 UTCGHSA enrichment
  8. 2026-08-20 16:11 UTCEG score recompute
  9. 2026-08-20 16:11 UTCGHSA enrichment
  10. 2026-08-20 15:27 UTCEG score recompute
  11. 2026-08-20 15:27 UTCGHSA enrichment
  12. 2026-08-20 13:25 UTCGHSA enrichment
  13. 2026-08-20 12:06 UTCGHSA enrichment
  14. 2026-08-20 08:09 UTCGHSA enrichment
  15. 2026-08-20 04:13 UTCGHSA enrichment
  16. 2026-08-20 00:16 UTCEG score recompute
  17. 2026-08-20 00:16 UTCGHSA enrichment
  18. 2026-08-19 20:19 UTCEG score recompute
  19. 2026-08-19 20:03 UTCEG score recompute
  20. 2026-08-19 20:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-16903?
CVE-2026-16903 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 attacker to execute arbitrary code or cause a denial of service due to an out-of-bounds write.
When was CVE-2026-16903 disclosed?
CVE-2026-16903 was first published in the National Vulnerability Database 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-2026-16903 actively exploited?
CVE-2026-16903 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.1% of all scored CVEs.
What is the CVSS score of CVE-2026-16903?
CVE-2026-16903 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-16903?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16903, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-16903

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