CVE-2026-84561

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

A double free issue was addressed with improved memory management. 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 app may be able to cause unexpected system termination or corrupt kernel memory.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
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-2026-84561(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 35× in last 7d / 35× 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 00:37 UTCGHSA enrichment
  2. 2026-09-19 20:18 UTCGHSA enrichment
  3. 2026-09-19 15:58 UTCEG score recompute
  4. 2026-09-19 15:58 UTCGHSA enrichment
  5. 2026-09-19 11:39 UTCGHSA enrichment
  6. 2026-09-19 07:15 UTCGHSA enrichment
  7. 2026-09-19 02:55 UTCGHSA enrichment
  8. 2026-09-18 22:35 UTCEG score recompute
  9. 2026-09-18 22:35 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:16 UTCGHSA enrichment
  12. 2026-09-18 13:56 UTCGHSA enrichment
  13. 2026-09-18 09:29 UTCGHSA enrichment
  14. 2026-09-18 05:09 UTCGHSA enrichment
  15. 2026-09-18 00:50 UTCGHSA enrichment
  16. 2026-09-17 20:31 UTCEG score recompute
  17. 2026-09-17 20:31 UTCGHSA enrichment
  18. 2026-09-17 19:32 UTCEPSS rescore
  19. 2026-09-17 16:09 UTCGHSA enrichment
  20. 2026-09-17 11:50 UTCGHSA enrichment
  21. 2026-09-17 07:30 UTCGHSA enrichment
  22. 2026-09-17 03:10 UTCGHSA enrichment
  23. 2026-09-16 22:50 UTCGHSA enrichment
  24. 2026-09-16 18:31 UTCEG score recompute
  25. 2026-09-16 18:30 UTCGHSA enrichment
Show 10 more
  1. 2026-09-16 15:28 UTCGHSA enrichment
  2. 2026-09-16 14:36 UTCEG score recompute▲ 9.80
  3. 2026-09-16 14:36 UTCGHSA enrichment
  4. 2026-09-16 14:35 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  5. 2026-09-16 14:09 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 15:00 UTCGHSA enrichment
  8. 2026-09-14 21:22 UTCNVD update
  9. 2026-09-14 20:59 UTCEG score recompute
  10. 2026-09-14 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84561?
CVE-2026-84561 is a critical vulnerability published on September 14, 2026. A double free issue was addressed with improved memory management. 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 app may be able to cause unexpected system termination or…
When was CVE-2026-84561 disclosed?
CVE-2026-84561 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-2026-84561 actively exploited?
CVE-2026-84561 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 50.2% of all scored CVEs.
What is the CVSS score of CVE-2026-84561?
CVE-2026-84561 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-84561?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84561, 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

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