CVE-2020-9861: Apple Swift

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

A stack overflow issue existed in Swift for Linux. The issue was addressed with improved input validation for dealing with deeply nested malicious JSON input.

Affected products

• Apple Swift: up to and including 5.1.4

Published 2020-11-02. Last modified 2026-06-17.