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.

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Source ID Title
Github GHSA Github GHSA GHSA-f5v4-2wr6-hqmg russh has pre-auth DoS via unbounded allocation in its keyboard-interactive auth handler
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 11 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 08 May 2026 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Eugeny
Eugeny russh
Vendors & Products Eugeny
Eugeny russh

Fri, 08 May 2026 20:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
Weaknesses CWE-770
CWE-789
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-11T14:23:49.308Z

Reserved: 2026-04-25T01:53:21.583Z

Link: CVE-2026-42189

cve-icon Vulnrichment

Updated: 2026-05-11T14:23:45.423Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-08T20:16:31.443

Modified: 2026-05-13T16:49:52.277

Link: CVE-2026-42189

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T23:00:15Z

Weaknesses