CVE-2026-35388
Received Received - Intake
Connection Multiplexing Confirmation Bypass in OpenSSH Before

Publication date: 2026-04-02

Last updated on: 2026-04-27

Assigner: MITRE

Description
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
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Meta Information
Published
2026-04-02
Last Modified
2026-04-27
Generated
2026-06-16
AI Q&A
2026-04-02
EPSS Evaluated
2026-06-14
NVD
CVE-2026-35388
EUVD
EUVD-2026-18404
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openbsd openssh to 10.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-420 The product protects a primary channel, but it does not use the same level of protection for an alternate channel.
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Executive Summary

This vulnerability exists in OpenSSH versions before 10.3 where the software omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

Impact Analysis

The vulnerability has a low severity score (CVSS 2.5) and involves a lack of confirmation in connection multiplexing for proxy-mode sessions. This could potentially lead to limited impact such as unauthorized session multiplexing or minor integrity issues, but it does not affect confidentiality or availability.

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