openssh: A flaw was found in OpenSSH
CVE-2026-55654 is fixed in 7 products on 1 platform, first by RHSA-2026:47757, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.
A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| openssh · Debian 14 | 1:10.4p1-5 | DEBIAN-CVE-2026-55654 | Jun 23, 2026 |
| openssh · RHEL 10 | 9.9p1-25.el10_2 | RHSA-2026:47757 | Jun 22, 2026 |
| openssh · RHEL 9 | 0:9.9p1-9.el9_8 | RHSA-2026:47756 | Jul 31, 2026 |
| openssh · almalinux 10 | 9.9p1-25.el10_2.alma.1 | ALSA-2026:47757 | Jul 29, 2026 |
| openssh · almalinux 9 | 9.9p1-9.el9_8.alma.1 | ALSA-2026:47756 | Jul 29, 2026 |
| openssh · ol 10 | 0:9.9p1-25.0.1.el10_2 | ELSA-2026-47757 | Jul 30, 2026 |
| openssh · ol 9 | 0:9.9p1-9.0.1.el9_8 | ELSA-2026-47756 | Aug 6, 2026 |
| openssh · rocky 10 | 0:9.9p1-25.el10_2.rocky.0.1 | RLSA-2026:47757 | Jul 30, 2026 |
| openssh · rocky 9 | 0:9.9p1-9.el9_8.rocky.0.1 | RLSA-2026:47756 | Jul 30, 2026 |
| openssh-askpass · RHEL 9 | 0:9.9p1-9.el9_8 | RHSA-2026:47756 | Jul 31, 2026 |
| openssh-askpass · almalinux 10 | 9.9p1-25.el10_2.alma.1 | ALSA-2026:47757 | Jul 29, 2026 |
| openssh-askpass · almalinux 9 | 9.9p1-9.el9_8.alma.1 | ALSA-2026:47756 | Jul 29, 2026 |
| openssh-askpass · ol 10 | 0:9.9p1-25.0.1.el10_2 | ELSA-2026-47757 | Jul 30, 2026 |
| openssh-askpass · ol 9 | 0:9.9p1-9.0.1.el9_8 | ELSA-2026-47756 | Aug 6, 2026 |
| openssh-clients · RHEL 9 | 0:9.9p1-9.el9_8 | RHSA-2026:47756 | Jul 31, 2026 |
| openssh-clients · almalinux 10 | 9.9p1-25.el10_2.alma.1 | ALSA-2026:47757 | Jul 29, 2026 |
| openssh-clients · almalinux 9 | 9.9p1-9.el9_8.alma.1 | ALSA-2026:47756 | Jul 29, 2026 |
| openssh-clients · ol 10 | 0:9.9p1-25.0.1.el10_2 | ELSA-2026-47757 | Jul 30, 2026 |
| openssh-clients · ol 9 | 0:9.9p1-9.0.1.el9_8 | ELSA-2026-47756 | Aug 6, 2026 |
| openssh-keycat · RHEL 9 | 0:9.9p1-9.el9_8 | RHSA-2026:47756 | Jul 31, 2026 |
| openssh-keycat · almalinux 10 | 9.9p1-25.el10_2.alma.1 | ALSA-2026:47757 | Jul 29, 2026 |
| openssh-keycat · almalinux 9 | 9.9p1-9.el9_8.alma.1 | ALSA-2026:47756 | Jul 29, 2026 |
| openssh-keycat · ol 10 | 0:9.9p1-25.0.1.el10_2 | ELSA-2026-47757 | Jul 30, 2026 |
| openssh-keycat · ol 9 | 0:9.9p1-9.0.1.el9_8 | ELSA-2026-47756 | Aug 6, 2026 |
| openssh-keysign · almalinux 10 | 9.9p1-25.el10_2.alma.1 | ALSA-2026:47757 | Jul 29, 2026 |
| openssh-keysign · ol 10 | 0:9.9p1-25.0.1.el10_2 | ELSA-2026-47757 | Jul 30, 2026 |
| openssh-server · RHEL 9 | 0:9.9p1-9.el9_8 | RHSA-2026:47756 | Jul 31, 2026 |
| openssh-server · almalinux 10 | 9.9p1-25.el10_2.alma.1 | ALSA-2026:47757 | Jul 29, 2026 |
| openssh-server · almalinux 9 | 9.9p1-9.el9_8.alma.1 | ALSA-2026:47756 | Jul 29, 2026 |
| openssh-server · ol 10 | 0:9.9p1-25.0.1.el10_2 | ELSA-2026-47757 | Jul 30, 2026 |
| openssh-server · ol 9 | 0:9.9p1-9.0.1.el9_8 | ELSA-2026-47756 | Aug 6, 2026 |
| pam_ssh_agent_auth · RHEL 9 | 0:0.10.4-7.9.el9_8 | RHSA-2026:47756 | Jul 31, 2026 |
| pam_ssh_agent_auth · almalinux 9 | 0.10.4-7.9.el9_8.alma.1 | ALSA-2026:47756 | Jul 29, 2026 |
| pam_ssh_agent_auth · ol 9 | 0:0.10.4-7.9.0.1.el9_8 | ELSA-2026-47756 | Aug 6, 2026 |
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