What is CVE-2026-35388?

CVE-2026-35388 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

Which CVE IDs does CVE-2026-35388 cover?

CVE-2026-35388 covers the following CVE IDs: CVE-2026-35388. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-35388?

CVE-2026-35388 has a CVSS v3 base score of 2.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-35388?

CVE-2026-35388 affects 4 products, including: azl3 openssh 9.8p1-5 on Azure Linux 3.0; cbl2 openssh 8.9p1-9; cbl2 openssh 8.9p1-9 on CBL Mariner 2.0; cbl2 openssh 8.9p1-9 on CBL-Mariner 2.0.

CVE-2026-35388LowCVSS 2.5

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

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-35388 →

🎯 Affected products4

azl3 openssh 9.8p1-5 on Azure Linux 3.0
cbl2 openssh 8.9p1-9
cbl2 openssh 8.9p1-9 on CBL Mariner 2.0
cbl2 openssh 8.9p1-9 on CBL-Mariner 2.0

✅ Remediation

KBRelease Notes (Security Update) KBCBL-Mariner Releases (Security Update) — fixed build 9.8p1-6

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35388
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade