Description
In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forwarding operations are concurrent.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenBSD | OpenSSH | < 10.5 | 10.5 |
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 | 1:10.5p1-1 | — |
| Debian 13 | openssh | No fix yet | — |
| Debian 12 | openssh | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | openssh-ssh1 | No fix yet | — |
| Ubuntu 26.04 LTS | openssh | 1:10.2p1-2ubuntu3.6 | USN-8721-1 |
| Ubuntu 26.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu 24.04 LTS | openssh | 1:9.6p1-3ubuntu13.19 | USN-8721-1 |
| Ubuntu 24.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu 22.04 LTS | openssh | 1:8.9p1-3ubuntu0.17 | USN-8721-1 |
| Ubuntu 22.04 LTS | openssh-ssh1 | No fix yet | — |
| Ubuntu 20.04 LTS | openssh-ssh1 | No fix yet | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | 1:9.6p1-3ubuntu13.19+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssh | No fix yet | — |
| 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 | 1:8.2p1-4ubuntu0.13+esm3 | USN-8804-1 |
| Ubuntu Pro 18.04 LTS | openssh | 1:7.6p1-4ubuntu0.7+esm6 | USN-8804-1 |
| Ubuntu Pro 16.04 LTS | openssh | 1:7.2p2-4ubuntu2.10+esm10 | USN-8804-1 |
| Ubuntu Pro 14.04 LTS | openssh | 1:6.6p1-2ubuntu2.13+esm4 | USN-8804-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssh +5 | 9.9p1-27.el10_2 | RHSA-2026:69129 |
| RHEL 9 | openssh +4 | 9.9p1-11.el9_8 | RHSA-2026:69130 |
| RHEL 9 | pam_ssh_agent_auth | 0.10.4-8.11.el9_8 | RHSA-2026:69130 |
| RHEL 8 | openssh +6 | 8.0p1-33.el8_10 | RHSA-2026:69266 |
| RHEL 8 | pam_ssh_agent_auth | 0.10.3-8.33.el8_10 | RHSA-2026:69266 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | openssh +5 | 9.9p1-7.el10_0.5 | RHSA-2026:76748 |
| Red Hat Hardened Images 1 | openssh +6 | 10.5p1-1.hum1 | RHSA-2026:70719 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssh +5 | 9.9p1-27.el10_2.alma.1 | ALSA-2026:69129 |
| AlmaLinux 9 | openssh +4 | 9.9p1-11.el9_8.alma.1 | ALSA-2026:69130 |
| AlmaLinux 9 | pam_ssh_agent_auth | 0.10.4-8.11.el9_8.alma.1 | ALSA-2026:69130 |
| AlmaLinux 8 | openssh +6 | 8.0p1-33.el8_10 | ALSA-2026:69266 |
| AlmaLinux 8 | pam_ssh_agent_auth | 0.10.3-8.33.el8_10 | ALSA-2026:69266 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssh | 9.9p1-27.el10_2.rocky.0.1 | RLSA-2026:69129 |
| Rocky Linux 9 | openssh | 9.9p1-11.el9_8.rocky.0.1 | RLSA-2026:69130 |
| Rocky Linux 8 | openssh | 8.0p1-33.el8_10 | RLSA-2026:69266 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssh | 9.6p1-150600.6.52.2 | SUSE-SU-2026:4827-1 |
| SLES 15 SP7 | openssh-askpass-gnome | 9.6p1-150600.6.52.1 | SUSE-SU-2026:4827-1 |
| SLES 15 SP6 | openssh | 9.6p1-150600.6.52.2 | SUSE-SU-2026:4827-1 |
| SLES 15 SP6 | openssh-askpass-gnome | 9.6p1-150600.6.52.1 | SUSE-SU-2026:4827-1 |
| SLES 15 SP5 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLES 15 SP5 | openssh-askpass-gnome | 8.4p1-150300.3.68.1 | SUSE-SU-2026:4811-1 |
| SLES 15 SP4 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLES 15 SP4 | openssh-askpass-gnome | 8.4p1-150300.3.68.1 | SUSE-SU-2026:4811-1 |
| SLES 12 SP5 | openssh +1 | 7.2p2-81.43.1 | SUSE-SU-2026:4686-1 |
| SLES 12 SP5 | openssh8.4 | 8.4p1-8.27.1 | SUSE-SU-2026:4614-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | openssh | 9.6p1-150600.6.52.2 | SUSE-SU-2026:4827-1 |
| SLES for SAP 15 SP6 | openssh-askpass-gnome | 9.6p1-150600.6.52.1 | SUSE-SU-2026:4827-1 |
| SLES for SAP 15 SP5 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLES for SAP 15 SP5 | openssh-askpass-gnome | 8.4p1-150300.3.68.1 | SUSE-SU-2026:4811-1 |
| SLES for SAP 15 SP4 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLES for SAP 15 SP4 | openssh-askpass-gnome | 8.4p1-150300.3.68.1 | SUSE-SU-2026:4811-1 |
| SLE Micro 6.1 | openssh | 9.6p1-slfo.1.1_7.1 | SUSE-SU-2026:24382-1 |
| SLE Micro 6.0 | openssh | 9.6p1-159998.1.1 | SUSE-SU-2026:24140-1 |
| SLE Micro 5.5 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLE Micro 5.4 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLE Micro 5.3 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLE HPC 15 SP5 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLE HPC 15 SP5 | openssh-askpass-gnome | 8.4p1-150300.3.68.1 | SUSE-SU-2026:4811-1 |
| SLE HPC 15 SP4 | openssh | 8.4p1-150300.3.68.2 | SUSE-SU-2026:4811-1 |
| SLE HPC 15 SP4 | openssh-askpass-gnome | 8.4p1-150300.3.68.1 | SUSE-SU-2026:4811-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssh | 10.3_p1-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssh +4 | 9.9p1-16.amzn2023.0.1 | ALAS2023-2026-3354 |
| Amazon Linux 2023 | pam_ssh_agent_auth | 0.10.4-10.16.amzn2023.0.1 | ALAS2023-2026-3354 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | openssh | 9.8p1-10 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | openssh +5 | 9.9p1-27.0.1.el10_2 | ELSA-2026-69129 |
| Oracle Linux 9 | openssh +4 | 9.9p1-11.0.1.el9_8 | ELSA-2026-69130 |
| Oracle Linux 9 | pam_ssh_agent_auth | 0.10.4-9.11.0.1.el9_8 | ELSA-2026-69130 |
| Oracle Linux 8 | openssh +6 | 8.0p1-33.0.1.el8_10 | ELSA-2026-69266 |
| Oracle Linux 8 | pam_ssh_agent_auth | 0.10.3-8.33.0.1.el8_10 | ELSA-2026-69266 |
Advisories 25
- WID-SEC-2026-2747 OpenSSH: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 3, 2026
- ALAS2023-2026-3354 Moderate: openssh security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- ALSA-2026:69130 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:69129 Important: openssh security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:69266 Important: openssh security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- SUSE-SU-2026:24382-1 Security update for openssh SUSE / openSUSE Security Updates · Oct 27, 2026
- SUSE-SU-2026:4811-1 Security update for openssh SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:4827-1 Security update for openssh SUSE / openSUSE Security Updates · Oct 21, 2026
- RHSA-2026:76748 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- SUSE-SU-2026:4686-1 Security update for openssh SUSE / openSUSE Security Updates · Oct 16, 2026
- SUSE-SU-2026:24140-1 Security update for openssh SUSE / openSUSE Security Updates · Oct 15, 2026
- RHSA-2026:69266 Red Hat Security Advisory: openssh security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:69129 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:69130 Red Hat Security Advisory: openssh security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-3642 Meinberg LANTIME: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 14, 2026
- SUSE-SU-2026:4614-1 Security update for openssh8.4 SUSE / openSUSE Security Updates · Oct 13, 2026
- RHSA-2026:70719 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 7, 2026
- ELSA-2026-69129 Important: openssh security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 29, 2026
- ELSA-2026-69266 Important: openssh security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 23, 2026
- USN-8804-1 openssh vulnerabilities Ubuntu Security Notices (USN) · Sep 22, 2026
- RLSA-2026:69130 Important: openssh security update Rocky Linux Security Advisories · Sep 22, 2026
- RLSA-2026:69129 Important: openssh security update Rocky Linux Security Advisories · Sep 22, 2026
- RLSA-2026:69266 Important: openssh security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 22, 2026
- ELSA-2026-69130 Important: openssh security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 22, 2026
- USN-8721-1 openssh vulnerabilities Ubuntu Security Notices (USN) · Sep 3, 2026