Vulnerability · Published Apr 2, 2026 · Assigned by mitre
CVE-2026-35388
Low 2.5
In plain English
A low-severity security flaw in OpenSSH from OpenBSD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)2.5Low
Exploit odds (30 days)0.1%top 97.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | openssh | 9.9p1-23.el10_2.alma.1 | ALSA-2026:19069 |
| AlmaLinux:10 | openssh | 9.9p1-14.el10_1.alma.1 | ALSA-2026:13380 |
| AlmaLinux:8 | openssh | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:9 | openssh | 8.7p1-49.el9_7.alma.1 | ALSA-2026:13381 |
| AlmaLinux:9 | openssh | 9.9p1-7.el9_8.alma.1 | ALSA-2026:19219 |
| AlmaLinux:10 | openssh-askpass | 9.9p1-23.el10_2.alma.1 | ALSA-2026:19069 |
| AlmaLinux:10 | openssh-askpass | 9.9p1-14.el10_1.alma.1 | ALSA-2026:13380 |
| AlmaLinux:8 | openssh-askpass | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:9 | openssh-askpass | 9.9p1-7.el9_8.alma.1 | ALSA-2026:19219 |
| AlmaLinux:9 | openssh-askpass | 8.7p1-49.el9_7.alma.1 | ALSA-2026:13381 |
| AlmaLinux:8 | openssh-cavs | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:10 | openssh-clients | 9.9p1-23.el10_2.alma.1 | ALSA-2026:19069 |
| AlmaLinux:10 | openssh-clients | 9.9p1-14.el10_1.alma.1 | ALSA-2026:13380 |
| AlmaLinux:8 | openssh-clients | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:9 | openssh-clients | 8.7p1-49.el9_7.alma.1 | ALSA-2026:13381 |
| AlmaLinux:9 | openssh-clients | 9.9p1-7.el9_8.alma.1 | ALSA-2026:19219 |
| AlmaLinux:10 | openssh-keycat | 9.9p1-23.el10_2.alma.1 | ALSA-2026:19069 |
| AlmaLinux:10 | openssh-keycat | 9.9p1-14.el10_1.alma.1 | ALSA-2026:13380 |
| AlmaLinux:8 | openssh-keycat | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:9 | openssh-keycat | 9.9p1-7.el9_8.alma.1 | ALSA-2026:19219 |
| AlmaLinux:9 | openssh-keycat | 8.7p1-49.el9_7.alma.1 | ALSA-2026:13381 |
| AlmaLinux:10 | openssh-keysign | 9.9p1-14.el10_1.alma.1 | ALSA-2026:13380 |
| AlmaLinux:10 | openssh-keysign | 9.9p1-23.el10_2.alma.1 | ALSA-2026:19069 |
| AlmaLinux:8 | openssh-ldap | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:10 | openssh-server | 9.9p1-14.el10_1.alma.1 | ALSA-2026:13380 |
| AlmaLinux:10 | openssh-server | 9.9p1-23.el10_2.alma.1 | ALSA-2026:19069 |
| AlmaLinux:8 | openssh-server | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:9 | openssh-server | 8.7p1-49.el9_7.alma.1 | ALSA-2026:13381 |
| AlmaLinux:9 | openssh-server | 9.9p1-7.el9_8.alma.1 | ALSA-2026:19219 |
| AlmaLinux:8 | pam_ssh_agent_auth | 0.10.3-7.29.el8_10 | ALSA-2026:13383 |
| AlmaLinux:9 | pam_ssh_agent_auth | 0.10.4-5.49.el9_7.alma.1 | ALSA-2026:13381 |
| AlmaLinux:9 | pam_ssh_agent_auth | 0.10.4-7.7.el9_8.alma.1 | ALSA-2026:19219 |
| Debian:12 | openssh | 1:9.2p1-2+deb12u10 | DEBIAN-CVE-2026-35388 |
| Debian:13 | openssh | 1:10.0p1-7+deb13u3 | DEBIAN-CVE-2026-35388 |
| Debian:14 | openssh | 1:10.3p1-1 | DEBIAN-CVE-2026-35388 |
| Rocky Linux:10 | openssh | 0:9.9p1-14.el10_1.rocky.0.1 | RLSA-2026:13380 |
| Rocky Linux:10 | openssh | 0:9.9p1-23.el10_2.rocky.0.1 | RLSA-2026:19069 |
| Rocky Linux:8 | openssh | 0:8.0p1-29.el8_10 | RLSA-2026:13383 |
| Rocky Linux:9 | openssh | 0:8.7p1-49.el9_7.rocky.0.1 | RLSA-2026:13381 |
| Rocky Linux:9 | openssh | 0:9.9p1-7.el9_8.rocky.0.1 | RLSA-2026:19219 |
| Ubuntu:22.04:LTS | openssh | 1:8.9p1-3ubuntu0.15 | UBUNTU-CVE-2026-35388 |
| Ubuntu:24.04:LTS | openssh | 1:9.6p1-3ubuntu13.16 | UBUNTU-CVE-2026-35388 |
| Ubuntu:25.10 | openssh | 1:10.0p1-5ubuntu5.4 | UBUNTU-CVE-2026-35388 |
| Ubuntu:26.04:LTS | openssh | 1:10.2p1-2ubuntu3.2 | UBUNTU-CVE-2026-35388 |
| Ubuntu:22.04:LTS | openssh-ssh1 | no fix listed | UBUNTU-CVE-2026-35388 |
| Ubuntu:24.04:LTS | openssh-ssh1 | no fix listed | UBUNTU-CVE-2026-35388 |
| Ubuntu:25.10 | openssh-ssh1 | no fix listed | UBUNTU-CVE-2026-35388 |
| Ubuntu:26.04:LTS | openssh-ssh1 | no fix listed | UBUNTU-CVE-2026-35388 |
| Ubuntu:26.10 | openssh-ssh1 | no fix listed | UBUNTU-CVE-2026-35388 |
Affected products (as reported)
Weakness: CWE-420 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N