CVE-2026-42189

HIGH

Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth

Title source: cna
STIX 2.1

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.

Scores

CVSS v3 7.5
EPSS 0.0048
EPSS Percentile 37.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-770 CWE-789
Status published
Products (4)
crates.io/russh 0 - 0.60.1crates.io
Eugeny/russh < 0.60.1
russh_project/russh < 0.60.1
warpgate_project/warpgate < 0.23.1
Published May 08, 2026
Tracked Since May 09, 2026