CVE-2026-86881

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

A certificate validation issue was addressed with improved certificate validation. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An attacker with a compromised intermediate certificate authority may be able to issue certificates with arbitrary extended key usages.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (8)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

About the security content of macOS Sequoia 15.8 - Apple Support

https://support.apple.com/en-us/149043
generic

About the security content of macOS Tahoe 26.7 - Apple Support

https://support.apple.com/en-us/149042
generic

About the security content of iOS 26.7 and iPadOS 26.7 - Apple Support

https://support.apple.com/en-us/149041
generic

About the security content of visionOS 27 - Apple Support

https://support.apple.com/en-us/149038
generic

About the security content of watchOS 27 - Apple Support

https://support.apple.com/en-us/149037
generic

About the security content of tvOS 27 - Apple Support

https://support.apple.com/en-us/149036
generic

About the security content of macOS Golden Gate 27 - Apple Support

https://support.apple.com/en-us/149035
generic

About the security content of iOS 27 and iPadOS 27 - Apple Support

https://support.apple.com/en-us/149034

Vendor Advisories for CVE-2026-86881(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 / 41× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 18:37 UTCGHSA enrichment
  3. 2026-09-20 14:15 UTCGHSA enrichment
  4. 2026-09-20 09:53 UTCGHSA enrichment
  5. 2026-09-20 05:31 UTCGHSA enrichment
  6. 2026-09-20 01:10 UTCGHSA enrichment
  7. 2026-09-19 20:48 UTCGHSA enrichment
  8. 2026-09-19 16:26 UTCEG score recompute
  9. 2026-09-19 16:26 UTCGHSA enrichment
  10. 2026-09-19 12:04 UTCGHSA enrichment
  11. 2026-09-19 07:42 UTCGHSA enrichment
  12. 2026-09-19 03:20 UTCGHSA enrichment
  13. 2026-09-18 22:58 UTCEG score recompute
  14. 2026-09-18 22:58 UTCGHSA enrichment
  15. 2026-09-18 19:28 UTCEPSS rescore
  16. 2026-09-18 18:37 UTCGHSA enrichment
  17. 2026-09-18 14:16 UTCGHSA enrichment
  18. 2026-09-18 09:45 UTCGHSA enrichment
  19. 2026-09-18 05:24 UTCGHSA enrichment
  20. 2026-09-18 01:03 UTCGHSA enrichment
  21. 2026-09-17 20:41 UTCEG score recompute
  22. 2026-09-17 20:41 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-17 16:19 UTCGHSA enrichment
  25. 2026-09-17 11:58 UTCGHSA enrichment
Show 16 more
  1. 2026-09-17 07:36 UTCGHSA enrichment
  2. 2026-09-17 03:14 UTCGHSA enrichment
  3. 2026-09-16 22:53 UTCGHSA enrichment
  4. 2026-09-16 18:30 UTCGHSA enrichment
  5. 2026-09-16 17:58 UTCEG score recompute
  6. 2026-09-16 17:58 UTCGHSA enrichment
  7. 2026-09-16 14:09 UTCEPSS rescore
  8. 2026-09-16 13:36 UTCGHSA enrichment
  9. 2026-09-16 13:06 UTCEG score recompute▲ 9.10
  10. 2026-09-16 13:06 UTCGHSA enrichment
  11. 2026-09-16 13:05 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 15:00 UTCGHSA enrichment
  14. 2026-09-14 21:22 UTCNVD update
  15. 2026-09-14 21:00 UTCEG score recompute
  16. 2026-09-14 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86881?
CVE-2026-86881 is a critical vulnerability published on September 14, 2026. A certificate validation issue was addressed with improved certificate validation. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An attacker with a compromised intermediate…
When was CVE-2026-86881 disclosed?
CVE-2026-86881 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86881 actively exploited?
CVE-2026-86881 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 76.1% of all scored CVEs.
What is the CVSS score of CVE-2026-86881?
CVE-2026-86881 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-86881?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86881, 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-2026-86881

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