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HIGH severity

CVE-2026-84584 — MACOS

HIGH

CVE-2026-84584 is a high-severity (CVSS 8.4) CWE-59 vulnerability in apple macos. A fix is available — see the affected versions and patch details below.

This issue was addressed with improved handling of symlinks. This issue is fixed in macOS Golden Gate 27. An app may be able to break out of its sandbox.

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-84584.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk
0.00%0.23%0.46%0.69%0.2%0.2%Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-84584 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 386,684 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

This issue was addressed with improved handling of symlinks. This issue is fixed in macOS Golden Gate 27. An app may be able to break out of its sandbox.

Affected Products

1 product · 1 configurations
OS
macosapple
< 27.0
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every apple macos deployment and check each version against the affected-products list above.

  2. Fix

    Apply the apple macos security patch or hotfix for CVE-2026-84584 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

This issue was addressed with improved handling of symlinks. This issue is fixed in macOS Golden Gate 27. An app may be able to break out of its sandbox.
O3 Security · Runtime Protection

Is CVE-2026-84584 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
CVE-2026-84584: MACOS (High 8.4)