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Vulnerability record · CVE-2026-35388 · published 2 April 2026

CVE-2026-35388: Openbsd openssh vulnerability

Openbsd · Openssh

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

2.5 CVSS 3.1 Low EPSS 0.23% · top 87.8% CWE-420 · CWE-420
2.5CVSS 3.1 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

Description

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

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2003-0786Openbsd openssh vulnerabilityThe SSH1 PAM challenge response authentication in OpenSSH 3.7.1 and 3.7.1p1, when Privilege Separation is disabled, does not check the result of the …EPSS 3.6%10.0CVE-2003-0693Openbsd openssh vulnerabilityA "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to execute arbitrary code by causing…EPSS 11%10.0CVE-2002-0640Openbsd openssh vulnerabilityBuffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large number of responses during chal…EPSS 27%10.0CVE-2001-0144Openbsd openssh vulnerabilityCORE SDI SSH1 CRC-32 compensation attack detector allows remote attackers to execute arbitrary commands on an SSH server or client via an integer ove…EPSS 32%10.0CVE-2000-0999Openbsd openssh vulnerabilityFormat string vulnerabilities in OpenBSD ssh program (and possibly other BSD-based operating systems) allow attackers to gain root privileges.EPSS 12%10.0CVE-2000-0525Openbsd openssh vulnerabilityOpenSSH does not properly drop privileges when the UseLogin option is enabled, which allows local users to execute arbitrary commands by providing th…EPSS 2.6%9.8CVE-2023-38408OpenSSH ssh-agent PKCS#11 search path flaw enables RCE via agent forwardingThe PKCS#11 support in ssh-agent in OpenSSH before 9.3p2 uses an insufficiently trustworthy search path, so code loaded from locations such as /usr/l…EPSS 80%analysed9.8CVE-2023-28531Openbsd openssh improper access control vulnerabilityssh-add in OpenSSH before 9.3 adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The earliest affected version is…EPSS 2.3%

Source: NIST National Vulnerability Database (record CVE-2026-35388), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.