The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1792197391 advisory.

  - In sftp in OpenSSH before 10.6, a server can trigger directory traversal (causing files to be written to     unintended locations) during a recursive copy operation. (CVE-2026-106552)

  - In sshd in OpenSSH before 10.6, credentials can incorrectly persist after failure of a     GSSAPIAuthentication authentication attempt. (CVE-2026-106553)

  - In sshd in OpenSSH before 10.6, GSSAPIAuthentication authentication state can incorrectly be persisted     across authentication attempts. (CVE-2026-106555)

  - In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is     contraindicated by the arXiv 2609.07709 Crossing the Streams findings. (CVE-2026-106582)

  - In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to     injection. (CVE-2026-106583)

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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:99573 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: OpenSSH: sftp client allows attacker to control downloaded file location (CVE-2026-59995)

    * openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options     (CVE-2026-59999)

    * openssh: openssh: Information disclosure via shared compression side-channel (CVE-2026-106582)

    * openssh: OpenSSH: Credential disclosure via failed GSSAPI authentication (CVE-2026-106553)

    * openssh: openssh: Denial of service via oversized decompressed packets (CVE-2026-106585)

    * openssh: openssh: Command injection via unvalidated command-line username (CVE-2026-106583)

    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 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-8928-1 advisory.

    It was discovered that OpenSSH's sftp client incorrectly handled paths returned by the server during a     recursive copy operation. A remote attacker controlling the server could possibly use this issue to write     files to unintended locations. (CVE-2026-106552)

    It was discovered that OpenSSH's sshd server incorrectly handled GSSAPIAuthentication state across     authentication attempts. An attacker could possibly use this issue to obtain credentials from a previous     failed authentication attempt. (CVE-2026-106553, CVE-2026-106555)

    It was discovered that OpenSSH incorrectly used an LZ77 dictionary coder during compression. An attacker     could possibly use this issue to obtain sensitive information. (CVE-2026-106582)

    It was discovered that OpenSSH's ssh client incorrectly allowed special characters in command-line     usernames. An attacker could possibly use this issue to inject arbitrary commands via specially crafted     usernames. (CVE-2026-106583)

    It was discovered that OpenSSH's ssh-keygen incorrectly handled Daylight Saving Time when converting     dates. An attacker could possibly use this issue to cause certificates to have incorrect expiration times.
    (CVE-2026-106584)

    It was discovered that OpenSSH did not check whether the maximum packet length was exceeded during     decompression. A remote attacker could possibly use this issue to cause a denial of service.
    (CVE-2026-106585)

    It was discovered that OpenSSH's sshd server incorrectly applied the restrict keyword from authorized_keys     to tunnel forwarding requests. A local attacker with an authorized key could possibly use this issue to     bypass intended tunnel forwarding restrictions. (CVE-2026-106586)

    It was discovered that OpenSSH's sshd server incorrectly handled certain configuration options that accept     a none value. An attacker could possibly use this issue to cause OpenSSH to behave unexpectedly.
    (CVE-2026-106587)

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

  - In sshd and ssh in OpenSSH before 10.6, there is no check for whether the maximum packet length is     exceeded during decompression of highly compressed data. (CVE-2026-106585)

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

The CentOS Linux 8.5 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.5:CLSA-2026:1792933979 advisory.

  - In sshd in OpenSSH before 10.6, credentials can incorrectly persist after failure of a     GSSAPIAuthentication authentication attempt. (CVE-2026-106553)

  - In sshd in OpenSSH before 10.6, GSSAPIAuthentication authentication state can incorrectly be persisted     across authentication attempts. (CVE-2026-106555)

  - In ssh in OpenSSH before 10.6, a $ or \ character can occur in a command-line username, leading to     injection. (CVE-2026-106583)

  - In sshd and ssh in OpenSSH before 10.6, there is no check for whether the maximum packet length is     exceeded during decompression of highly compressed data. (CVE-2026-106585)

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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:99592 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: OpenSSH: sftp client allows attacker to control downloaded file location (CVE-2026-59995)

    * openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options     (CVE-2026-59999)

    * openssh: openssh: Information disclosure via shared compression side-channel (CVE-2026-106582)

    * openssh: OpenSSH: Credential disclosure via failed GSSAPI authentication (CVE-2026-106553)

    * openssh: openssh: Denial of service via oversized decompressed packets (CVE-2026-106585)

    * openssh: openssh: Command injection via unvalidated command-line username (CVE-2026-106583)

    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.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
366706	AlmaLinux 9.2 [TuxCare] Security Update: openssh / openssh-askpass / openssh-clients / openssh-keycat / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1792197391)	Nessus	Alma Linux Local Security Checks	2026/10/17	2026/10/17	high
379611	RHEL 8 : openssh (RHSA-2026:99573)	Nessus	Red Hat Local Security Checks	2026/11/12	2026/11/12	high
367205	Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSH vulnerabilities (USN-8928-1)	Nessus	Ubuntu Local Security Checks	2026/10/19	2026/10/19	high
371374	Linux Distros Unpatched Vulnerability : CVE-2026-106585	Nessus	Misc.	2026/10/23	2026/11/6	medium
371942	CentOS Linux 8.5 [TuxCare] Security Update: openssh / openssh-askpass / openssh-cavs / openssh-clients / etc Multiple Vulnerabilities (CENTOS8.5:CLSA-2026:1792933979)	Nessus	CentOS Local Security Checks	2026/10/25	2026/10/25	high
379602	RHEL 8 : openssh (RHSA-2026:99592)	Nessus	Red Hat Local Security Checks	2026/11/12	2026/11/12	high

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