CVE-2026-86929

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-26 · updated 2026-10-28
Weakness: CWE-125

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2. Processing a maliciously crafted file may lead to arbitrary code execution.

Affected products

Apple macOS: from 15.0 before 15.8.2; from 26.0 before 26.7.2 — fixed in 15.8.2, 26.7.2
Apple macOS: before 15.8.2; before 26.7.2; before 27 — fixed in 15.8.2, 26.7.2, 27

How to fix

Upgrade to a fixed version: Apple macOS 15.8.2, 26.7.2; Apple macOS 15.8.2, 26.7.2, 27. Check the vendor advisory for mitigations.

References

https://support.apple.com/en-us/149035
https://support.apple.com/en-us/149522
https://support.apple.com/en-us/149523

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