CVE-2026-42189

Russh is a Rust SSH client & server library. Prior to version 0.60.1, a pre-authentication denial-of-service vulnerability exists in the server's keyboard-interactive authentication handler. A malicious client can crash any russh-based server that implements keyboard-interactive auth (e.g., for 2FA/TOTP) with a single malformed packet, requiring no credentials. This issue has been patched in version 0.60.1.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 41% of CVEs (scores of 2026-10-26)

CWEs

CWE-770, CWE-789

Published

2026-05-08

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• russh_project:russh
• warpgate_project:warpgate

Packages (OSV)

References

• https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1
• https://github.com/Eugeny/russh/releases/tag/v0.60.1
• https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg
• https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg

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