OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
Conclusion & alert: CVE-2026-35388 is rated Low Risk (10.5/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.01%). Mandatory action: Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-03 | — | 0.01% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 2.5 | 3.1 | LOW |
|
1.0 | 1.4 | [email protected] |
| 2.5 | 3.1 | LOW |
|
1.0 | 1.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-35388 not yet assigned priority: Debian including 1 source packages (openssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-35388 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2026-35388 |
suse
|
low | CVE-2026-35388 severity low: SUSE including 4 source package names (openssh, openssh-cavs, openssh-fips, openssh-helpers), 8 product×package rows across 3 product lines (SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE, SUSE Linux Enterprise Server 12 SP4-LTSS, SUSE Linux Enterprise Server Teradata 12 SP3): Known Not Affected 8. | https://www.suse.com/security/cve/CVE-2026-35388/ |
ubuntu
|
medium | CVE-2026-35388 medium priority: Ubuntu including 2 source packages (openssh, openssh-ssh1), 16 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): ignored 7, needs-triage 5, released 4. | https://ubuntu.com/security/CVE-2026-35388 |
| URL | Tags |
|---|---|
| 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 |