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

CVSS 5.3 · Medium EPSS 0.28% · P19

Affected Version Matrix 1

VendorProductVersion RangeStatus
Eugenyrussh>= 0.34.0-beta.1, < 0.61.0affected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
Eugenyrussh >= 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-2026-481107.5 HIGHRussh: SSH message fields were decoded through allocation-first parsers before field-speci
CVE-2026-467027.5 HIGHRussh: Post-decompression SSH packet size was not bounded, allowing remote oversized compr
CVE-2026-466737.5 HIGHRussh: Unchecked CryptoVec allocation and growth handling is reachable from local agent in
CVE-2026-481076.5 MEDIUMRussh: Unchecked keyboard-interactive prompt count in client auth path
CVE-2026-467055.3 MEDIUMrussh 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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