# CVE-2026-55654: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-55654
- Priority: High
- CVSS: 7.7 (low)
- EPSS: 0.0065
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 22, 2026

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | openssh Debian 14 | 1:10.4p1-5 | [DEBIAN-CVE-2026-55654](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55654.md) | Jun 23, 2026 |
| Linux | openssh RHEL 10 | 9.9p1-25.el10_2 | [RHSA-2026:47757](https://patchblox.com/security/data/fix/linux/rhsa-2026-47757.md) | Jun 22, 2026 |
| Linux | openssh RHEL 9 | 0:9.9p1-9.el9_8 | [RHSA-2026:47756](https://patchblox.com/security/data/fix/linux/rhsa-2026-47756.md) | Jul 31, 2026 |
| Linux | openssh almalinux 10 | 9.9p1-25.el10_2.alma.1 | [ALSA-2026:47757](https://patchblox.com/security/data/fix/linux/alsa-2026-47757.md) | Jul 29, 2026 |
| Linux | openssh almalinux 9 | 9.9p1-9.el9_8.alma.1 | [ALSA-2026:47756](https://patchblox.com/security/data/fix/linux/alsa-2026-47756.md) | Jul 29, 2026 |
| Linux | openssh ol 10 | 0:9.9p1-25.0.1.el10_2 | [ELSA-2026-47757](https://patchblox.com/security/data/fix/linux/elsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh ol 9 | 0:9.9p1-9.0.1.el9_8 | [ELSA-2026-47756](https://patchblox.com/security/data/fix/linux/elsa-2026-47756.md) | Aug 6, 2026 |
| Linux | openssh rocky 10 | 0:9.9p1-25.el10_2.rocky.0.1 | [RLSA-2026:47757](https://patchblox.com/security/data/fix/linux/rlsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh rocky 9 | 0:9.9p1-9.el9_8.rocky.0.1 | [RLSA-2026:47756](https://patchblox.com/security/data/fix/linux/rlsa-2026-47756.md) | Jul 30, 2026 |
| Linux | openssh-askpass RHEL 9 | 0:9.9p1-9.el9_8 | [RHSA-2026:47756](https://patchblox.com/security/data/fix/linux/rhsa-2026-47756.md) | Jul 31, 2026 |
| Linux | openssh-askpass almalinux 10 | 9.9p1-25.el10_2.alma.1 | [ALSA-2026:47757](https://patchblox.com/security/data/fix/linux/alsa-2026-47757.md) | Jul 29, 2026 |
| Linux | openssh-askpass almalinux 9 | 9.9p1-9.el9_8.alma.1 | [ALSA-2026:47756](https://patchblox.com/security/data/fix/linux/alsa-2026-47756.md) | Jul 29, 2026 |
| Linux | openssh-askpass ol 10 | 0:9.9p1-25.0.1.el10_2 | [ELSA-2026-47757](https://patchblox.com/security/data/fix/linux/elsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh-askpass ol 9 | 0:9.9p1-9.0.1.el9_8 | [ELSA-2026-47756](https://patchblox.com/security/data/fix/linux/elsa-2026-47756.md) | Aug 6, 2026 |
| Linux | openssh-clients RHEL 9 | 0:9.9p1-9.el9_8 | [RHSA-2026:47756](https://patchblox.com/security/data/fix/linux/rhsa-2026-47756.md) | Jul 31, 2026 |
| Linux | openssh-clients almalinux 10 | 9.9p1-25.el10_2.alma.1 | [ALSA-2026:47757](https://patchblox.com/security/data/fix/linux/alsa-2026-47757.md) | Jul 29, 2026 |
| Linux | openssh-clients almalinux 9 | 9.9p1-9.el9_8.alma.1 | [ALSA-2026:47756](https://patchblox.com/security/data/fix/linux/alsa-2026-47756.md) | Jul 29, 2026 |
| Linux | openssh-clients ol 10 | 0:9.9p1-25.0.1.el10_2 | [ELSA-2026-47757](https://patchblox.com/security/data/fix/linux/elsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh-clients ol 9 | 0:9.9p1-9.0.1.el9_8 | [ELSA-2026-47756](https://patchblox.com/security/data/fix/linux/elsa-2026-47756.md) | Aug 6, 2026 |
| Linux | openssh-keycat RHEL 9 | 0:9.9p1-9.el9_8 | [RHSA-2026:47756](https://patchblox.com/security/data/fix/linux/rhsa-2026-47756.md) | Jul 31, 2026 |
| Linux | openssh-keycat almalinux 10 | 9.9p1-25.el10_2.alma.1 | [ALSA-2026:47757](https://patchblox.com/security/data/fix/linux/alsa-2026-47757.md) | Jul 29, 2026 |
| Linux | openssh-keycat almalinux 9 | 9.9p1-9.el9_8.alma.1 | [ALSA-2026:47756](https://patchblox.com/security/data/fix/linux/alsa-2026-47756.md) | Jul 29, 2026 |
| Linux | openssh-keycat ol 10 | 0:9.9p1-25.0.1.el10_2 | [ELSA-2026-47757](https://patchblox.com/security/data/fix/linux/elsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh-keycat ol 9 | 0:9.9p1-9.0.1.el9_8 | [ELSA-2026-47756](https://patchblox.com/security/data/fix/linux/elsa-2026-47756.md) | Aug 6, 2026 |
| Linux | openssh-keysign almalinux 10 | 9.9p1-25.el10_2.alma.1 | [ALSA-2026:47757](https://patchblox.com/security/data/fix/linux/alsa-2026-47757.md) | Jul 29, 2026 |
| Linux | openssh-keysign ol 10 | 0:9.9p1-25.0.1.el10_2 | [ELSA-2026-47757](https://patchblox.com/security/data/fix/linux/elsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh-server RHEL 9 | 0:9.9p1-9.el9_8 | [RHSA-2026:47756](https://patchblox.com/security/data/fix/linux/rhsa-2026-47756.md) | Jul 31, 2026 |
| Linux | openssh-server almalinux 10 | 9.9p1-25.el10_2.alma.1 | [ALSA-2026:47757](https://patchblox.com/security/data/fix/linux/alsa-2026-47757.md) | Jul 29, 2026 |
| Linux | openssh-server almalinux 9 | 9.9p1-9.el9_8.alma.1 | [ALSA-2026:47756](https://patchblox.com/security/data/fix/linux/alsa-2026-47756.md) | Jul 29, 2026 |
| Linux | openssh-server ol 10 | 0:9.9p1-25.0.1.el10_2 | [ELSA-2026-47757](https://patchblox.com/security/data/fix/linux/elsa-2026-47757.md) | Jul 30, 2026 |
| Linux | openssh-server ol 9 | 0:9.9p1-9.0.1.el9_8 | [ELSA-2026-47756](https://patchblox.com/security/data/fix/linux/elsa-2026-47756.md) | Aug 6, 2026 |
| Linux | pam_ssh_agent_auth RHEL 9 | 0:0.10.4-7.9.el9_8 | [RHSA-2026:47756](https://patchblox.com/security/data/fix/linux/rhsa-2026-47756.md) | Jul 31, 2026 |
| Linux | pam_ssh_agent_auth almalinux 9 | 0.10.4-7.9.el9_8.alma.1 | [ALSA-2026:47756](https://patchblox.com/security/data/fix/linux/alsa-2026-47756.md) | Jul 29, 2026 |
| Linux | pam_ssh_agent_auth ol 9 | 0:0.10.4-7.9.0.1.el9_8 | [ELSA-2026-47756](https://patchblox.com/security/data/fix/linux/elsa-2026-47756.md) | Aug 6, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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