CVE-2026-84517

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-14 · updated 2026-10-26
Weakness: CWE-190

Description

An integer overflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to cause unexpected system termination.

Affected products

Apple macOS: from 15.0 before 15.8; from 26.0 before 26.7 — fixed in 15.8, 26.7
Apple macOS: before 15.8; before 26.7; before 27 — fixed in 15.8, 26.7, 27

How to fix

Upgrade to a fixed version: Apple macOS 15.8, 26.7; Apple macOS 15.8, 26.7, 27. Check the vendor advisory for mitigations.

References

https://support.apple.com/en-us/149035
https://support.apple.com/en-us/149042
https://support.apple.com/en-us/149043

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