TI-2026-31887 Aliases CVE-2026-43798

Stack-based buffer overflow in Apple swift-nio-ssh

MEDIUM 49CWE-121Published 2026-08-20 · Updated 2026-08-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

A single crafted SSH message gives an unauthenticated network attacker an out-of-bounds stack write of attacker-controlled length and content against any application built on swift-nio-ssh. This vulnerability is addressed in swift-nio-ssh version 0.14.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0047 40th percentileScored 2026-11-07

Fix Fixed swift-nio-ssh (Apple): 0.14.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apple	swift-nio-ssh	before 0.14.1	0.14.1	Patch available	CNA

swift-nio-ssh VendorApple Affected before 0.14.1 Fixed in 0.14.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:apple:swiftnio_ssh::::::swift::*	before 0.14.1	Vulnerable	Apple

cpe:2.3:a:apple:swiftnio_ssh:*:*:*:*:*:swift:*:* Versions before 0.14.1 Vulnerable ·Apple

Remediation

Fix · CNA swift-nio-ssh (Apple) Fixed in 0.14.1

Timeline

2026-10-02 Threatist record created from CVE-2026-43798

References

Patch 1

https://github.com/apple/swift-nio-ssh/security/advisories/GHSA-998x-vgvp-xwpc

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences