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ALSA-2026:47756 — Important: openssh security update

Affected: AlmaLinux:9: openssh, AlmaLinux:9: openssh-askpass, AlmaLinux:9: openssh-clients, AlmaLinux:9: openssh-keycat, AlmaLinux:9: openssh-server, AlmaLinux:9: pam_ssh_agent_auth

OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.

Security Fix(es):

* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in AlmaLinux OpenSSH client versions (CVE-2026-55655) * openssh: Double free in AlmaLinux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653) * openssh: Heap out-of-bounds read in AlmaLinux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654) * openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002) * openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Withdrawn: BELL-CVE-2026-55654 — CVE-2026-55654 does not affect BellSoft software

Withdrawn by the publisher.

EUVD-2026-375515

fkie_cve-2026-55654

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.

GHSA-5mx2-7g4j-9m39

RHSA-2026:36759 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions

RHSA-2026:47756 — Red Hat Security Advisory: openssh security update

RLSA-2026:47756 — Important: openssh security update

Affected: Rocky Linux:9: openssh

OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.

Security Fix(es):

* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Rocky Linux OpenSSH client versions (CVE-2026-55655)

* openssh: Double free in Rocky Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)

* openssh: Heap out-of-bounds read in Rocky Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654)

* openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)

* openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

UBUNTU-CVE-2026-55654

Affected: Ubuntu:18.04:LTS: openssh-ssh1, Ubuntu:20.04:LTS: openssh-ssh1, Ubuntu:22.04:LTS: openssh-ssh1, Ubuntu:24.04:LTS: openssh-ssh1, Ubuntu:25.10: openssh, Ubuntu:25.10: openssh-ssh1, Ubuntu:26.04:LTS: openssh-ssh1

WID-SEC-W-2026-2039 — OpenSSH: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in OpenSSH ausnutzen, um einen Denial of Service Angriff durchzuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder vertrauliche Informationen offenzulegen.