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CVE-2026-35388

Quick assessment

Affected
OpenBSD OpenSSH
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.

OpenSSH（OpenBSD Secure Shell）是加拿大OpenBSD开源的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH 10.3之前版本存在安全漏洞，该漏洞源于代理模式多路复用会话缺少连接确认。

CVSS 2.5 · Low EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1571 · Non-Standard Port
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I. Basic Information for CVE-2026-35388

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未保护的候选通道
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSH 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSH（OpenBSD Secure Shell）是加拿大OpenBSD开源的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH 10.3之前版本存在安全漏洞，该漏洞源于代理模式多路复用会话缺少连接确认。
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
OpenBSD OpenSSH 0 ~ 10.3 -

II. Public POCs for CVE-2026-35388

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III. Intelligence Information for CVE-2026-35388

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Mailing List Discussions for CVE-2026-35388 (2)

Other References for CVE-2026-35388 (1)

Same Patch Batch · OpenBSD · 2026-04-02 · 5 CVEs total

CVE-2026-35385 7.5 HIGH OpenSSH 安全漏洞
CVE-2026-35414 4.2 MEDIUM OpenSSH 安全漏洞
CVE-2026-35386 3.6 LOW OpenSSH 安全漏洞
CVE-2026-35387 3.1 LOW OpenSSH 安全漏洞

IV. Related Vulnerabilities

Same product: OpenSSH
Same vendor: OpenBSD
Same weakness: CWE-420

V. Comments for CVE-2026-35388

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