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CVE-2026-73430— Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)

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之前版本存在异常处理不当漏洞，该漏洞源于处理SSH_MSG_KEX_ECDH_INIT消息时未正确验证全零Q_C值，导致索引越界并触发panic，可能允许未经身份验证的SSH客户端在身份验证前终止服务器密钥交换任务，造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.60% · P47

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-2026-73430

Vulnerability Information
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Vulnerability Title
Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client & server library. Prior to 0.62.4, an unauthenticated SSH client can cause a denial of service by sending SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value. Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the all-zero peer public value and computes an all-zero shared secret, after which compute_exchange_hash calls encode_mpint in russh/src/kex/mod.rs and indexes beyond the end of the input while skipping leading zero bytes. The resulting panic occurs before authentication and terminates the server key-exchange task. 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
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Eugene Russh 异常处理不当漏洞
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之前版本存在异常处理不当漏洞，该漏洞源于处理SSH_MSG_KEX_ECDH_INIT消息时未正确验证全零Q_C值，导致索引越界并触发panic，可能允许未经身份验证的SSH客户端在身份验证前终止服务器密钥交换任务，造成拒绝服务。
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-2026-73430

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III. Intelligence Information for CVE-2026-73430

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Patches & Fixes for CVE-2026-73430 (1)

Vendor Advisories for CVE-2026-73430 (1)

Vendor Pages for CVE-2026-73430 (1)

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-754

V. Comments for CVE-2026-73430

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