CVE-2026-86871
Medium
Description
An integer underflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An attacker with control of a network file server may be able to cause unexpected system termination.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Apple Macos
PublishedOct 20, 2026
First seenOct 20, 2026
How to fix
Update
- apple macos15.8, 26.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apple macos | v < 15.8, 26.0 ≤ v < 26.7 | 15.8, 26.7 |
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