AppleCVE-2026-86901

Apple macOS: out-of-bounds write

CVE-2026-86901 · Published Sep 14, 2026 · updated Sep 18, 2026

High7.1

Fix: upgrade to 27 or later

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27. Mounting a maliciously crafted exFAT volume may cause unexpected system termination or kernel memory disclosure.

Affected versions

Package	Affected	Fixed in
macOS Product	< 27	27

Details and references

CVSS 3.1: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Severity from: CISA (its enrichment of the CVE record)
Weakness: CWE-787

More Apple advisories

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Medium 5.5Sep 14

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Apple iOS and iPadOS: out-of-bounds readCVE-2026-86903fixed in 27 +2 High 7.5Sep 14

A privacy issue was addressed with improved state managementCVE-2026-86904fixed in 26.7 +2 Medium 5.5Sep 14

Apple iOS and iPadOS: improper access controlCVE-2026-86905fixed in 27 +2 Medium 4.4Sep 14

Apple macOS: protection mechanism failureCVE-2026-86909fixed in 27 Medium 5.5Sep 14

Apple macOS: path traversalCVE-2026-86910fixed in 15.8 +2