Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-84566

CVE-2026-84566HIGH

Apple iOS and iPadOS — The issue was addressed with improved memory handling.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .0017    5.5     —

AFFECTED
  Product         Versions     Fixed
  iOS and iPadOS  unspecified  —
  macOS           unspecified  —

TIMELINE
  Sep 1   Reserved by apple
  Sep 14  Published (CNA: apple)
  Sep 18  RESCORED — CVE-2026-84566 (Apple iOS and iPadOS). CVSS 8.4 → 7.8 (NVD).

CWE-119 · CNA: apple · CVSS v3.1 · 5 references · NVD status: Analyzed

Description

The issue was addressed with improved memory handling. 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. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 1, 2026	Reserved	Reserved by apple
September 14, 2026	Published	Published (CNA: apple)
September 18, 2026	RESCORED	RESCORED — CVE-2026-84566 (Apple iOS and iPadOS). CVSS 8.4 → 7.8 (NVD).

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apple	iOS and iPadOS	—	—	—
Apple	macOS	—	—	—

Weaknesses

CWE-119

References (5)

https://support.apple.com/en-us/149034 [Release Notes, Vendor Advisory]
https://support.apple.com/en-us/149035 [Release Notes, Vendor Advisory]
https://support.apple.com/en-us/149041 [Release Notes, Vendor Advisory]
https://support.apple.com/en-us/149042 [Release Notes, Vendor Advisory]
https://support.apple.com/en-us/149043 [Release Notes, Vendor Advisory]

Authoritative record: CVE-2026-84566 at cve.org

Vendors: apple

Weaknesses: CWE-119

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-84566 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.