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CVE-2026-46702— Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets

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0.61.1之前版本存在安全漏洞，该漏洞源于启用SSH压缩时接受解压后过大的数据包，可能导致远程拒绝服务或资源耗尽。

CVSS 7.5 · High EPSS 0.46% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh >= 0.34.0, < 0.61.1 affected
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I. Basic Information for CVE-2026-46702

Vulnerability Information
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Vulnerability Title
Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.1, when SSH compression is enabled, russh accepted compressed packets whose on-wire size passed the normal transport packet-length checks but whose decompressed size was much larger. This allowed a remote peer to send oversized post-decompression packets that should have been rejected. In current releases, this is a remote denial-of-service / resource-exhaustion issue in the post-decompression receive path. In older releases before 0.58.0, the same remote decompression path used CryptoVec, which appears to make the historical impact worse. This issue has been patched in version 0.61.1.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Russh 安全漏洞
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0.61.1之前版本存在安全漏洞，该漏洞源于启用SSH压缩时接受解压后过大的数据包，可能导致远程拒绝服务或资源耗尽。
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, < 0.61.1 -

II. Public POCs for CVE-2026-46702

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10398 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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III. Intelligence Information for CVE-2026-46702

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Vendor Advisories for CVE-2026-46702 (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-2026-46673 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-770

V. Comments for CVE-2026-46702

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