CVE-2026-42189
Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 CWE-789 |
| Vendor | eugeny |
| Product | russh |
| Published | May 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Eugeny / russh
< 0.60.1