GHSA-76R6-X97P-67VR Russh: SSH identification parsing accepted non-canonical client banners and did not bound pre-banner input

Summary russh did not enforce the SSH identification-string rules as deliberately as OpenSSH. In particular, the server-side identification reader used the same permissive path as the client, allowing pre-banner lines from clients, and the reader did not enforce a bounded number of pre-banner...

CVE-2026-46705 russh server userauth state is not reset when authentication principal changes

Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, the russh server authentication path keeps internal userauth state across SSHMSGUSERAUTHREQUEST messages without separating that state when the request principal changes. RFC 4252 allows the user nam...

CVE-2026-46705 russh server userauth state is not reset when authentication principal changes

Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, the russh server authentication path keeps internal userauth state across SSHMSGUSERAUTHREQUEST messages without separating that state when the request principal changes. RFC 4252 allows the user nam...

CVE-2026-46705

The vulnerability CVE-2026-46705 affects russh (Rust SSH client/server) versions 0.34.0-beta.1 through before 0.61.0. The server’s authentication path retained russh-owned state (e.g., remaining methods, partial_success, and in-progress state) across SSH_MSG_USERAUTH_REQUEST messages when the use...

GHSA-HPV4-5H6F-WQR3 russh server userauth state is not reset when authentication principal changes

Summary The russh server authentication path keeps internal userauth state across SSHMSGUSERAUTHREQUEST messages without separating that state when the request principal changes. RFC 4252 allows the user name and service name fields to change between authentication requests. The issue is not that...

russh server userauth state is not reset when authentication principal changes

Summary The russh server authentication path keeps internal userauth state across SSHMSGUSERAUTHREQUEST messages without separating that state when the request principal changes. RFC 4252 allows the user name and service name fields to change between authentication requests. The issue is not that...

PT-2026-45018

Name of the Vulnerable Software and Affected Versions Russh versions 0.34.0-beta.1 through 0.60.x Description The server authentication path in the Russh library fails to separate internal user authentication state when the request principal changes across SSH MSG USERAUTH REQUEST messages...

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...

russh has pre-auth DoS via unbounded allocation in its keyboard-interactive auth handler

Summary 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 credential...