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CVE-2026-42189— Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth

Quick assessment

Affected
Eugeny russh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Russh是Eugene个人开发者的一个 Rust SSH 客户端和服务器端库。 Russh 0.60.1之前版本存在安全漏洞，该漏洞源于服务器键盘交互认证处理程序中存在预认证拒绝服务漏洞，可能导致恶意客户端通过单个畸形数据包使服务器崩溃。

CVSS 7.5 · High EPSS 0.76% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh < 0.60.1 affected
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I. Basic Information for CVE-2026-42189

Vulnerability Information
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Vulnerability Title
Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Russh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Russh是Eugene个人开发者的一个 Rust SSH 客户端和服务器端库。 Russh 0.60.1之前版本存在安全漏洞，该漏洞源于服务器键盘交互认证处理程序中存在预认证拒绝服务漏洞，可能导致恶意客户端通过单个畸形数据包使服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eugeny russh < 0.60.1 -

II. Public POCs for CVE-2026-42189

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III. Intelligence Information for CVE-2026-42189

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Patches & Fixes for CVE-2026-42189 (1)

Vendor Advisories for CVE-2026-42189 (1)

Vendor Pages for CVE-2026-42189 (1)

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-770

V. Comments for CVE-2026-42189

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