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 outcome occurs only on the client side.)

oracle_linux ELSA-2026-47757: ELSA-2026-47757:  openssh security update (IMPORTANT)

alma_linux ALSA-2026:47757: ALSA-2026:47757: openssh security update (High)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:47756 advisory.

    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 Red Hat Enterprise Linux     OpenSSH client versions (CVE-2026-55655)

    * 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 (CVE-2026-55653)

    * openssh: Heap out-of-bounds read in Red Hat Enterprise 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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:47757 advisory.

    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 Red Hat Enterprise Linux     OpenSSH client versions (CVE-2026-55655)

    * 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 (CVE-2026-55653)

    * openssh: Heap out-of-bounds read in Red Hat Enterprise 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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:47757 advisory.

    * 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)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the openssh package has been released.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-169fd93089 advisory.

    - CVE-2026-59996: Fix remote glob result of .. causing files to be placed in unintended parent     directories when scp performs remote-to-remote copy via the local host
    - CVE-2026-60002: Fix use-after-free in cached hostkey during key re-exchange

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the openssh-9.9p1-10.el9 build changelog.

  - Fix use-after-free in cached hostkey during key re-exchange (CVE-2026-60002)

  - Fix remote glob result of .. causing files to be placed in unintended parent directories when scp     performs remote-to-remote copy via the local host (CVE-2026-59996)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-c9d8542bb3 advisory.

    - CVE-2026-59996: Fix remote glob result of .. causing files to be placed in unintended parent     directories when scp performs remote-to-remote copy via the local host
    - CVE-2026-60002: Fix use-after-free in cached hostkey during key re-exchange

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8533-1 advisory.

    It was discovered that OpenSSH sftp did not properly constrain the location of downloaded files when     connecting to an attacker-controlled server. An attacker could possibly use this issue to write files to     unintended locations on the file system. (CVE-2026-59995)

    It was discovered that OpenSSH scp could place files in the parent directory of the intended destination     when copying between two remote hosts. An attacker could possibly use this issue to write files to     unintended locations. (CVE-2026-59996)

    It was discovered that OpenSSH internal-sftp only recognized the first nine command-line arguments, This     could result in certain security-sensitive arguments being ignored, contrary to expectations.
    (CVE-2026-59997)

    It was discovered that OpenSSH had undocumented behaviour regarding the GSSAPIStrictAcceptorCheck option     in environments using Windows Active Directory. The documentation has been updated to clarify use of the     option. (CVE-2026-59998)

    It was discovered that OpenSSH did not properly enforce precedence of DisableForwarding=yes over     PermitTunnel=yes in server configurations. This could possibly result in intended network forwarding     restrictions being bypassed, contrary to expectations. (CVE-2026-59999)

    It was discovered that OpenSSH mishandled the MaxAuthTries limit for GSSAPI authentication. A remote     attacker could use this issue to perform excessive authentication attempts. (CVE-2026-60000)

    It was discovered that OpenSSH did not always honour the minimum authentication delay. An attacker could     possibly use this issue to perform brute-force attacks more efficiently. (CVE-2026-60001)

    It was discovered that the OpenSSH client had a use-after-free vulnerability when a server changed its     host key during a key re-exchange. An attacker able to intercept communications could possibly use this     issue to execute arbitrary code or obtain sensitive information. (CVE-2026-60002)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of OpenSSH installed on the remote host is prior to 10.4. It is, therefore, affected by multiple vulnerabilities, including:

  - 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 outcome occurs only on the client side. (CVE-2026-60002)

  - sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay. (CVE-2026-60001)

  - In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over     PermitTunnel=yes, but did not. (CVE-2026-59999)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 outcome occurs only on the client side.) (CVE-2026-60002)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
330864	RHEL 9 : openssh (RHSA-2026:47756)	Nessus	Red Hat Local Security Checks	critical
330850	RHEL 10 : openssh (RHSA-2026:47757)	Nessus	Red Hat Local Security Checks	critical
330844	RockyLinux 10 : openssh (RLSA-2026:47757)	Nessus	Rocky Linux Local Security Checks	critical
328777	Photon OS 5.0: Openssh PHSA-2026-5.0-0926	Nessus	PhotonOS Local Security Checks	critical
328436	Fedora 43 : openssh (2026-169fd93089)	Nessus	Fedora Local Security Checks	critical
328035	CentOS 9 : openssh-9.9p1-10.el9	Nessus	CentOS Local Security Checks	critical
327810	Fedora 44 : openssh (2026-c9d8542bb3)	Nessus	Fedora Local Security Checks	critical
326800	Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSH vulnerabilities (USN-8533-1)	Nessus	Ubuntu Local Security Checks	critical
326244	OpenSSH < 10.4 Multiple Vulnerabilities	Nessus	Misc.	critical
325636	Linux Distros Unpatched Vulnerability : CVE-2026-60002	Nessus	Misc.	critical

Detections

Analytics

CVE-2026-60002

critical

Tenable Plugins

Coming Soon

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical