AppleCVE-2026-86900

Apple macOS: out-of-bounds read

CVE-2026-86900 · Published Sep 14, 2026 · updated Sep 18, 2026

Medium6.5

Fix: upgrade to 27 or later

An out-of-bounds read issue was addressed with improved input validation. 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:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Severity from: CISA (its enrichment of the CVE record)
Weakness: CWE-125

More Apple advisories

All Apple

Medium 5.5Sep 14

Apple macOS: path traversalCVE-2026-86902fixed in 14.8.8 +1 Medium 5.5Sep 14

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