CVE-2026-43798

EUVD-2026-63655
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 38.5%
Affected Products (NVD)
VendorProductVersion
appleswiftnio_ssh
𝑥
< 0.14.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/apple/swift-nio-ssh/security/advisories/GHSA-998x-vgvp-xwpc