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CVE-2026-48107— Russh: Unchecked keyboard-interactive prompt count in client auth path

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 0.37.0版本至0.61.0之前版本存在输入验证错误漏洞，该漏洞源于在键盘交互身份验证路径中，恶意SSH服务器发送攻击者控制的提示计数，客户端在验证提示数据是否实际存在之前直接使用该计数进行Vec::with_capacity分配，可能导致内存分配问题。

CVSS 6.5 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh >= 0.37.0, < 0.61.0 affected
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I. Basic Information for CVE-2026-48107

Vulnerability Information
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Vulnerability Title
Russh: Unchecked keyboard-interactive prompt count in client auth path
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client & server library. From version 0.37.0 to before version 0.61.0, in the russh client keyboard-interactive authentication path, a malicious SSH server could send a USERAUTH_INFO_REQUEST with an attacker-controlled prompt count, and the client would use that raw count directly in Vec::with_capacity(...) before validating that enough prompt data was actually present in the packet. This issue has been patched in version 0.61.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Russh 输入验证错误漏洞
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 0.37.0版本至0.61.0之前版本存在输入验证错误漏洞，该漏洞源于在键盘交互身份验证路径中，恶意SSH服务器发送攻击者控制的提示计数，客户端在验证提示数据是否实际存在之前直接使用该计数进行Vec::with_capacity分配，可能导致内存分配问题。
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 >= 0.37.0, < 0.61.0 -

II. Public POCs for CVE-2026-48107

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III. Intelligence Information for CVE-2026-48107

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Vendor Advisories for CVE-2026-48107 (1)

Same Patch Batch · Eugeny · 2026-06-10 · 6 CVEs total

CVE-2026-48110 7.5 HIGH Russh: SSH message fields were decoded through allocation-first parsers before field-speci
CVE-2026-46702 7.5 HIGH Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compr
CVE-2026-46673 7.5 HIGH Russh: Unchecked CryptoVec allocation and growth handling is reachable from local agent in
CVE-2026-48108 5.3 MEDIUM Russh: SSH identification parsing accepted non-canonical client banners and did not bound
CVE-2026-46705 5.3 MEDIUM russh server userauth state is not reset when authentication principal changes

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-20

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