CVE-2026-43798

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

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-25)

CWE

CWE-121

Published

2026-08-20

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• apple:swiftnio_ssh

References

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

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