CVE-2026-35388

EUVD-2026-18404
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
2.5 LOW
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
mitreCNA
2.5 LOW
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
openbsdopenssh
𝑥
< 10.3
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
openssh
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
Common Weakness Enumeration
References
https://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2
https://www.openssh.org/releasenotes.html#10.3p1
https://www.openwall.com/lists/oss-security/2026/04/02/3