CVE-2020-9861

7.5 highEPSS 1.5%

High (7.5) in apple swift. 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.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
CWE: CWE-674
Published: 2020-11-02
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

apple:swift

References

https://forums.swift.org/t/swift-5-1-5-for-linux-jsonserialization-limit-recursion-when-parsing/34514
https://forums.swift.org/t/swift-5-1-5-for-linux-jsonserialization-limit-recursion-when-parsing/34514

Check your stack JSON