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CVE-2026-73429— Russh: client wrong-length X25519 `clone_from_slice` panic (pre-auth DoS)

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.

Eugene Russh是Eugene个人开发者的一个实现SSH协议功能的开发框架。 Eugene Russh 0.62.4之前版本存在安全漏洞，该漏洞源于未验证服务器临时值长度即传递给clone_from_slice，可能导致客户端会话崩溃。

CVSS 5.3 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh < 0.62.4 affected
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I. Basic Information for CVE-2026-73429

Vulnerability Information
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Vulnerability Title
Russh: client wrong-length X25519 `clone_from_slice` panic (pre-auth DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client & server library. Prior to 0.62.4, a malicious SSH server can crash a russh client session with a malformed KEX_ECDH_REPLY containing a server ephemeral value that is not 32 bytes long. The client-side Curve25519Kex::compute_shared_secret function in russh/src/kex/curve25519.rs passes the decoded exchange.server_ephemeral value to clone_from_slice without validating its length, causing a deterministic panic before the server host key is verified. The panic terminates the spawned client session task and surfaces as a JoinError, while the embedding process normally remains running. This issue is fixed in version 0.62.4.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的类型转换
Source: CVE Program / CVE List V5
Vulnerability Title
Eugene Russh 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eugene Russh是Eugene个人开发者的一个实现SSH协议功能的开发框架。 Eugene Russh 0.62.4之前版本存在安全漏洞，该漏洞源于未验证服务器临时值长度即传递给clone_from_slice，可能导致客户端会话崩溃。
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 < 0.62.4 -

II. Public POCs for CVE-2026-73429

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III. Intelligence Information for CVE-2026-73429

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Patches & Fixes for CVE-2026-73429 (1)

Vendor Advisories for CVE-2026-73429 (1)

Vendor Pages for CVE-2026-73429 (1)

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-704

V. Comments for CVE-2026-73429

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