What is CVE-2026-35388?

CVE-2026-35388 is a low-severity vulnerability in Openbsd Openssh, classified under Unprotected Alternate Channel. CVSS score: 2.5/10. Published 2026-04-02.

How severe is CVE-2026-35388?

Low severity. CVSS v3 base score is 2.5 out of 10.

Vulnerability in Openbsd Openssh

CVE-2026-35388

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

EPSS: 0.000 (3.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Openbsd Openssh — versions 0

Weakness classification (CWE)

CWE-420 — Unprotected Alternate Channel

References

www.openssh.org/releasenotes.html
marc.info/
www.openwall.com/lists/oss-security/2026/04/02/3

Frequently asked questions

What is CVE-2026-35388?: CVE-2026-35388 is a low-severity vulnerability in Openbsd Openssh, classified under Unprotected Alternate Channel. CVSS score: 2.5/10. Published 2026-04-02.
How severe is CVE-2026-35388?: Low severity. CVSS v3 base score is 2.5 out of 10.