CVE-2026-43798CWE-121

CVE-2026-43798

Critical · published August 21, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
39.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00470 · 39.7th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2026-08-21T01:17Z
Affected products (1)
ProductVersionsFixed in
apple/swiftnio_ssh< 0.14.10.14.1
References (1)
https://github.com/apple/swift-nio-ssh/security/advisories/GHSA-998x-vgvp-xwpc · [email protected]
EPSS history
Timeline
  • 20 AUG 21:07Z
    A single crafted SSH message gives an unauthenticated network attacker an out-of-bounds stack write of attacker-controlled length and content against any…
    cvelistv5