Description
OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenBSD | OpenSSH | < 10.3 | 10.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssh | 1:10.3p1-1 | — |
| Debian 13 | openssh | 1:10.0p1-7+deb13u3 | — |
| Debian 12 | openssh | 1:9.2p1-2+deb12u10 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | openssh-ssh1 | No fix yet | — |
| Ubuntu 26.04 LTS | openssh | 1:10.2p1-2ubuntu3.2 | — |
| Ubuntu 26.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu 25.10 | openssh | 1:10.0p1-5ubuntu5.4 | — |
| Ubuntu 25.10 | openssh-ssh1 | No fix yet | — |
| Ubuntu 24.04 LTS | openssh | 1:9.6p1-3ubuntu13.16 | — |
| Ubuntu 24.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu 22.04 LTS | openssh | 1:8.9p1-3ubuntu0.15 | — |
| Ubuntu 22.04 LTS | openssh-ssh1 | No fix yet | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu 18.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu Pro FIPS 20.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | openssh | 1:9.6p1-3ubuntu13.16+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssh | 1:8.9p1-3ubuntu0.15+Fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro 20.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openssh | No fix yet | — |
| Ubuntu Pro 14.04 LTS | openssh | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssh +5 | 9.9p1-14.el10_1 | RHSA-2026:19069, RHSA-2026:13380 |
| RHEL 9 | openssh +4 | 8.7p1-49.el9_7 | RHSA-2026:19219, RHSA-2026:13381 |
| RHEL 9 | pam_ssh_agent_auth | 0.10.4-5.49.el9_7 | RHSA-2026:19219, RHSA-2026:13381 |
| RHEL 8 | openssh +6 | 8.0p1-29.el8_10 | RHSA-2026:13383 |
| RHEL 8 | pam_ssh_agent_auth | 0.10.3-7.29.el8_10 | RHSA-2026:13383 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | openssh +5 | 9.9p1-7.el10_0.3 | RHSA-2026:12389 |
| RHEL 9.6 EUS | openssh +4 | 8.7p1-45.el9_6.3 | RHSA-2026:16059 |
| RHEL 9.6 EUS | pam_ssh_agent_auth | 0.10.4-5.45.el9_6.3 | RHSA-2026:16059 |
| RHEL 9.4 EUS | openssh +4 | 8.7p1-38.el9_4.8 | RHSA-2026:22564 |
| RHEL 9.4 EUS | pam_ssh_agent_auth | 0.10.4-5.38.el9_4.8 | RHSA-2026:22564 |
| RHEL 9.2 E4S | openssh +4 | 8.7p1-30.el9_2.11 | RHSA-2026:22648 |
| RHEL 9.2 E4S | pam_ssh_agent_auth | 0.10.4-5.30.el9_2.11 | RHSA-2026:22648 |
| RHEL 8.8 TUS | openssh +2 | 8.0p1-20.el8_8.4 | RHSA-2026:21298 |
| RHEL 8.8 E4S | openssh +2 | 8.0p1-20.el8_8.4 | RHSA-2026:21298 |
| RHEL 8.6 TUS | openssh +6 | 8.0p1-15.el8_6.5 | RHSA-2026:21398 |
| RHEL 8.6 TUS | pam_ssh_agent_auth | 0.10.3-7.15.el8_6.5 | RHSA-2026:21398 |
| RHEL 8.6 E4S | openssh +6 | 8.0p1-15.el8_6.5 | RHSA-2026:21398 |
| RHEL 8.6 E4S | pam_ssh_agent_auth | 0.10.3-7.15.el8_6.5 | RHSA-2026:21398 |
| RHEL 8.6 AUS | openssh +6 | 8.0p1-15.el8_6.5 | RHSA-2026:21398 |
| RHEL 8.6 AUS | pam_ssh_agent_auth | 0.10.3-7.15.el8_6.5 | RHSA-2026:21398 |
| RHEL 8.4 EUS Long Life | openssh +2 | 8.0p1-7.el8_4.2 | RHSA-2026:22329 |
| RHEL 8.4 AUS | openssh +2 | 8.0p1-7.el8_4.2 | RHSA-2026:22329 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssh +5 | 9.9p1-14.el10_1.alma.1 | ALSA-2026:19069, ALSA-2026:13380 |
| AlmaLinux 9 | openssh +4 | 8.7p1-49.el9_7.alma.1 | ALSA-2026:19219, ALSA-2026:13381 |
| AlmaLinux 9 | pam_ssh_agent_auth | 0.10.4-5.49.el9_7.alma.1 | ALSA-2026:19219, ALSA-2026:13381 |
| AlmaLinux 8 | openssh +6 | 8.0p1-29.el8_10 | ALSA-2026:13383 |
| AlmaLinux 8 | pam_ssh_agent_auth | 0.10.3-7.29.el8_10 | ALSA-2026:13383 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssh | 9.9p1-14.el10_1.rocky.0.1 | RLSA-2026:19069, RLSA-2026:13380 |
| Rocky Linux 9 | openssh | 8.7p1-49.el9_7.rocky.0.1 | RLSA-2026:19219, RLSA-2026:13381 |
| Rocky Linux 8 | openssh | 8.0p1-29.el8_10 | RLSA-2026:13383 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssh +1 | 9.6p1-150600.6.42.1 | SUSE-SU-2026:2371-1 |
| SLES 15 SP6 | openssh +1 | 9.6p1-150600.6.42.1 | SUSE-SU-2026:2371-1 |
| SLES 15 SP5 | openssh +1 | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLES 15 SP4 | openssh +1 | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLES 12 SP5 | openssh8.4 | 8.4p1-8.24.1 | SUSE-SU-2026:2430-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssh +1 | 10.0p2-160000.6.1 | SUSE-SU-2026:22352-1 |
| SLES for SAP 15 SP6 | openssh +1 | 9.6p1-150600.6.42.1 | SUSE-SU-2026:2371-1 |
| SLES for SAP 15 SP5 | openssh +1 | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLES for SAP 15 SP4 | openssh +1 | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLES 16.0 | openssh +1 | 10.0p2-160000.6.1 | SUSE-SU-2026:22352-1 |
| SLE Micro 6.2 | openssh | 10.0p2-160000.6.1 | SUSE-SU-2026:22268-1 |
| SLE Micro 6.1 | openssh | 9.6p1-slfo.1.1_6.1 | SUSE-SU-2026:22067-1 |
| SLE Micro 6.0 | openssh | 9.6p1-6.1 | SUSE-SU-2026:23249-1 |
| SLE Micro 5.5 | openssh | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLE Micro 5.4 | openssh | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLE Micro 5.3 | openssh | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLE HPC 15 SP5 | openssh +1 | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
| SLE HPC 15 SP4 | openssh +1 | 8.4p1-150300.3.65.1 | SUSE-SU-2026:2375-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssh | 10.3p1-6.1 | openSUSE-SU-2026:10937-1 |
| openSUSE Leap 16.0 | openssh +1 | 10.0p2-160000.6.1 | openSUSE-SU-2026:21044-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssh +3 | 8.7p1-8.amzn2023.0.18 | ALAS2023-2026-1745 |
| Amazon Linux 2023 | pam_ssh_agent_auth | 0.10.4-4.8.amzn2023.0.18 | ALAS2023-2026-1745 |
| Amazon Linux 2 | openssh +7 | 7.4p1-22.amzn2.0.13 | ALAS2-2026-3320 |
| Amazon Linux 2 | pam_ssh_agent_auth | 0.10.3-2.22.amzn2.0.13 | ALAS2-2026-3320 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | openssh | 9.8p1-6 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | openssh +5 | 9.9p1-14.0.1.el10_1 | ELSA-2026-19069, ELSA-2026-13380 |
| Oracle Linux 9 | openssh +4 | 8.7p1-49.0.1.el9_7 | ELSA-2026-19219, ELSA-2026-13381 |
| Oracle Linux 9 | pam_ssh_agent_auth | 0.10.4-5.49.0.1.el9_7 | ELSA-2026-19219, ELSA-2026-13381 |
| Oracle Linux 8 | openssh +6 | 8.0p1-29.0.1.el8_10 | ELSA-2026-13383 |
| Oracle Linux 8 | pam_ssh_agent_auth | 0.10.3-7.29.0.1.el8_10 | ELSA-2026-13383 |
Advisories 41
- ALSA-2026:13380 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:19219 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:13381 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:19069 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:13383 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:22648 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:22564 Red Hat Security Advisory: openssh update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:22329 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:21398 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:21298 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:19219 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:19069 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:16059 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:13381 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:13383 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:13380 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:12389 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- WID-SEC-2026-0979 OpenSSH: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 22, 2026
- WID-SEC-2026-2253 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- SUSE-SU-2026:23249-1 Security update for openssh SUSE / openSUSE Security Updates · Aug 27, 2026
- WID-SEC-2026-1666 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 28, 2026
- ELSA-2026-19069 Important: openssh security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
- SUSE-SU-2026:22352-1 Security update for openssh SUSE / openSUSE Security Updates · Jul 2, 2026
- openSUSE-SU-2026:21044-1 Security update for openssh SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22268-1 Security update for openssh SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:2430-1 Security update for openssh8.4 SUSE / openSUSE Security Updates · Jun 18, 2026
- SUSE-SU-2026:22067-1 Security update for openssh SUSE / openSUSE Security Updates · Jun 13, 2026
- SUSE-SU-2026:2371-1 Security update for openssh SUSE / openSUSE Security Updates · Jun 12, 2026
- SUSE-SU-2026:2375-1 Security update for openssh SUSE / openSUSE Security Updates · Jun 12, 2026
- ELSA-2026-19219 Important: openssh security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 12, 2026
- openSUSE-SU-2026:10937-1 openssh-10.3p1-6.1 on GA media SUSE / openSUSE Security Updates · Jun 3, 2026
- RLSA-2026:19069 Important: openssh security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:19219 Important: openssh security update Rocky Linux Security Advisories · May 28, 2026
- ALAS2-2026-3320 Moderate: openssh security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 26, 2026
- ALAS2023-2026-1745 Moderate: openssh security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 26, 2026
- RLSA-2026:13380 Important: openssh security update Rocky Linux Security Advisories · May 21, 2026
- RLSA-2026:13381 Important: openssh security update Rocky Linux Security Advisories · May 21, 2026
- RLSA-2026:13383 Important: openssh security update Rocky Linux Security Advisories · May 6, 2026
- ELSA-2026-13381 Important: openssh security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 5, 2026
- ELSA-2026-13383 Important: openssh security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 5, 2026
- ELSA-2026-13380 Important: openssh security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · May 5, 2026