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)
* 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.
Fixed packages 6
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | openssh | 9.9p1-9.el9_8.alma.1 |
| AlmaLinux · 9 | openssh-askpass | 9.9p1-9.el9_8.alma.1 |
| AlmaLinux · 9 | openssh-clients | 9.9p1-9.el9_8.alma.1 |
| AlmaLinux · 9 | openssh-keycat | 9.9p1-9.el9_8.alma.1 |
| AlmaLinux · 9 | openssh-server | 9.9p1-9.el9_8.alma.1 |
| AlmaLinux · 9 | pam_ssh_agent_auth | 0.10.4-7.9.el9_8.alma.1 |
Vulnerabilities 5
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High 7.7
ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchange. (This…
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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…
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Medium 4.2
scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occurs betwe…
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Low 3.7
Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination
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…
References
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report
https://access.redhat.com/security/cve/CVE-2026-55653
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report
https://access.redhat.com/security/cve/CVE-2026-55654
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report
https://access.redhat.com/security/cve/CVE-2026-55655
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report
https://access.redhat.com/security/cve/CVE-2026-59996
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report
https://access.redhat.com/security/cve/CVE-2026-60002
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report
https://bugzilla.redhat.com/2462250
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report
https://bugzilla.redhat.com/2462351
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report
https://bugzilla.redhat.com/2462493
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report
https://bugzilla.redhat.com/2497936
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report
https://bugzilla.redhat.com/2497944
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advisory
https://errata.almalinux.org/9/ALSA-2026-47756.html