What’s Vulnerable › Vulnerabilities

CVE-2026-35388

• Severity: low (CVSS 2.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-420

Description

OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

Affected products

• OpenSSH: before 10.3 — fixed in 10.3

How to fix

Upgrade to a fixed version: OpenSSH 10.3. Check the vendor advisory for mitigations.

References

• https://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2
• https://www.openssh.org/releasenotes.html#10.3p1
• https://www.openwall.com/lists/oss-security/2026/04/02/3

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