CVE-2026-42189
HIGHRussh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg
X_Refsource_Misc x_refsource_misc
https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1
X_Refsource_Misc x_refsource_misc
https://github.com/Eugeny/russh/releases/tag/v0.60.1
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