Summary
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)
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.
Fixed packages 8
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | openssh | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | openssh-askpass | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | openssh-cavs | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | openssh-clients | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | openssh-keycat | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | openssh-ldap | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | openssh-server | 8.0p1-30.el8_10 |
| AlmaLinux · 8 | pam_ssh_agent_auth | 0.10.3-7.30.el8_10 |
Vulnerabilities 2
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Medium 5.0
Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X …
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Medium 4.3
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
A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the clie…