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-2026-84558

CVE-2026-84558MEDIUM

Apple macOS — A double free issue was addressed with improved memory management.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  N  N  H    5.5   .0015    3.8     —

AFFECTED
  Product  Versions     Fixed
  macOS    unspecified  —

TIMELINE
  Sep 1   Reserved by apple
  Sep 14  Published (CNA: apple)
  Sep 16  ENRICHED — CVE-2026-84558 (Apple macOS). Received CVSS 5.5 and CPE data from NVD.

CWE-415 · CNA: apple · CVSS v3.1 · 1 reference · NVD status: Modified

Description

A double free issue was addressed with improved memory management. This issue is fixed in macOS Golden Gate 27. An app may be able to cause unexpected system termination.

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 16, 2026	ENRICHED	ENRICHED — CVE-2026-84558 (Apple macOS). Received CVSS 5.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apple	macOS	—	—	—

Weaknesses

CWE-415

References (1)

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

Authoritative record: CVE-2026-84558 at cve.org

Vendors: apple

Weaknesses: CWE-415

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-84558 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.