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CVE-2026-48110— Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds

Quick assessment

Affected
Eugeny russh
Exploitation
Public or AI PoC available; prioritize validation
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，该漏洞源于多个消息处理器在应用字段特定边界之前解码攻击者控制的SSH字符串、名称列表和字节字段为自有分配，可能导致远程SSH对等方发送过大、高扇出或格式错误的长度前缀字段，使库在拒绝本应提前拒绝的输入之前进行分配或尝试分配。

CVSS 7.5 · High EPSS 0.46% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh >= 0.34.0, < 0.61.0 affected
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I. Basic Information for CVE-2026-48110

Vulnerability Information
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Vulnerability Title
Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.0, several russh client and server message handlers decoded attacker-controlled SSH strings, name-lists, and byte fields into owned allocations before applying field-specific bounds. A remote SSH peer could send oversized, high-fanout, or malformed length-prefixed fields and make the library allocate, attempt to allocate, or split data before rejecting input that should have been rejected earlier. 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: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 0.34.0版本至0.61.0之前版本存在输入验证错误漏洞，该漏洞源于多个消息处理器在应用字段特定边界之前解码攻击者控制的SSH字符串、名称列表和字节字段为自有分配，可能导致远程SSH对等方发送过大、高扇出或格式错误的长度前缀字段，使库在拒绝本应提前拒绝的输入之前进行分配或尝试分配。
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, < 0.61.0 -

II. Public POCs for CVE-2026-48110

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8532 chars
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III. Intelligence Information for CVE-2026-48110

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Vendor Advisories for CVE-2026-48110 (1)

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

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-2026-48108 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

V. Comments for CVE-2026-48110

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