CVE-2026-42189— Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-42189
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- Release v0.60.1 · Eugeny/russh · GitHubx_refsource_MISC
- Merge commit from fork · Eugeny/russh@6c3c80a · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-42189
IV. Related Vulnerabilities
Same vendor: Eugeny
Same weakness: CWE-770
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V. Comments for CVE-2026-42189
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