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CVE-2026-48108— Russh: SSH identification parsing accepted non-canonical client banners and did not bound pre-banner input

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 0.34.0-beta.1版本至0.61.0之前版本存在输入验证错误漏洞，该漏洞源于未严格执行SSH标识字符串规则，服务端标识读取器使用与客户端相同的宽松路径，允许来自客户端的预横幅行且未限制预横幅行数量，可能导致远程对等方在明文预身份验证阶段使用格式错误的标识输入占用连接设置资源。

CVSS 5.3 · Medium EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh >= 0.34.0-beta.1, < 0.61.0 affected
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I. Basic Information for CVE-2026-48108

Vulnerability Information
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Vulnerability Title
Russh: SSH identification parsing accepted non-canonical client banners and did not bound pre-banner input
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, russh did not enforce the SSH identification-string rules as deliberately as OpenSSH. In particular, the server-side identification reader used the same permissive path as the client, allowing pre-banner lines from clients, and the reader did not enforce a bounded number of pre-banner lines. For a library server built on russh, this could allow a remote peer to hold connection setup resources in the cleartext pre-authentication phase with malformed identification input that should have been rejected early. 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:N/S:U/C:N/I:N/A:L
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 0.34.0-beta.1版本至0.61.0之前版本存在输入验证错误漏洞，该漏洞源于未严格执行SSH标识字符串规则，服务端标识读取器使用与客户端相同的宽松路径，允许来自客户端的预横幅行且未限制预横幅行数量，可能导致远程对等方在明文预身份验证阶段使用格式错误的标识输入占用连接设置资源。
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 >= 0.34.0-beta.1, < 0.61.0 -

II. Public POCs for CVE-2026-48108

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III. Intelligence Information for CVE-2026-48108

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Vendor Advisories for CVE-2026-48108 (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-2026-48107 6.5 MEDIUM Russh: Unchecked keyboard-interactive prompt count in client auth path
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

V. Comments for CVE-2026-48108

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