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Vulnerability record · CVE-2026-43798 · published 20 August 2026

CVE-2026-43798: Apple swiftnio ssh stack-based buffer overflow vulnerability

Apple · Swiftnio Ssh

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.

9.8 CVSS 3.1 Critical EPSS 0.47% · top 61.8% CWE-121 · Stack-based buffer overflow
9.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
3 Sep 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-43798), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.