scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occurs between two remote destinations.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-47756 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       Resolves: RHEL-193178
    - CVE-2026-60002: Fix use-after-free in cached hostkey during key re-exchange       Resolves: RHEL-193024
    - CVE-2026-55653: Fix double free in openssh DH-GEX client path during       FIPS known-group validation that leads to client-side denial of service       Resolves: RHEL-186439
    - CVE-2026-55654: Fix heap out-of-bounds read during GSSAPI indicator       cleanup due to missing NULL terminator       Resolves: RHEL-185836

Tenable has extracted the preceding description block directly from the Oracle 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 MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1533:08 advisory.

    * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in MIRACLE LINUX OpenSSH     client versions (CVE-2026-55655)
      * openssh: Double free in MIRACLE 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 MIRACLE 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 MiracleLinux 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3605-1 advisory.

    - Backported support for the mlkemx25519 key exchange from upstream (jsc#PED-16473).

    - CVE-2026-59995: sftp: location of downloaded files not properly constrained when `sftp server:/path .`     is used with       an attacker-controlled server (bsc#1271044).
    - CVE-2026-59996: scp: file placed in the parent directory of an intended target directory when copy     occurs between two       remote destinations (bsc#1271046).
    - CVE-2026-59997: sshd: `internal-sftp` command lines are silently truncated after the 9th argument     (bsc#1271048).
    - CVE-2026-59998: sshd: undocumented security-relevant `GSSAPIStrictAcceptorCheck` behavior in Windows     Active Directory       is not documented (bsc#1271049).
    - CVE-2026-59999: sshd: `DisableForwarding=yes` does not override `PermitTunnel=yes` (bsc#1271052).
    - CVE-2026-60000: sshd: pre-authentication denial of service when GSSAPIAuthentication is enabled     (bsc#1271053).
    - CVE-2026-60001: sshd: minimum authentication delay is not honored (bsc#1271054).
    - CVE-2026-60002: ssh: client-side use-after-free when a server changes its host key during a key     reexchange       (bsc#1271055).

Tenable has extracted the preceding description block directly from the SUSE 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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2031 advisory.

    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 client processes attacker-controlled DH-GEX group     parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of     Service (DoS). (CVE-2026-55653)

    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 socket is used. A successful attack can compromise the     confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow     some manipulation of the forwarded session. (CVE-2026-55655)

    scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy     occurs between two remote destinations. (CVE-2026-59996)

    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)

Tenable has extracted the preceding description block directly from the tested product 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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21477-1 advisory.

    - CVE-2026-59995: sftp: location of downloaded files not properly constrained when `sftp server:/path .`     is used with       an attacker-controlled server (bsc#1271044).
    - CVE-2026-59996: scp: file placed in the parent directory of an intended target directory when copy     occurs between two       remote destinations (bsc#1271046).
    - CVE-2026-59997: sshd: `internal-sftp` command lines are silently truncated after the 9th argument     (bsc#1271048).
    - CVE-2026-59998: sshd: undocumented security-relevant `GSSAPIStrictAcceptorCheck` behavior in Windows     Active Directory       is not documented (bsc#1271049).
    - CVE-2026-59999: sshd: `DisableForwarding=yes` does not override `PermitTunnel=yes` (bsc#1271052).
    - CVE-2026-60000: sshd: pre-authentication denial of service when GSSAPIAuthentication is enabled     (bsc#1271053).
    - CVE-2026-60001: sshd: minimum authentication delay is not honored (bsc#1271054).
    - CVE-2026-60002: ssh: client-side use-after-free when a server changes its host key during a key     reexchange       (bsc#1271055).

Tenable has extracted the preceding description block directly from the SUSE 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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:47756 advisory.

    * 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)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:47756 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.

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

    * 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)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-47757 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       Resolves: RHEL-193170
    - CVE-2026-60002: Fix use-after-free in cached hostkey during key re-exchange       Resolves: RHEL-193016
    - CVE-2026-55653: Fix double free in openssh DH-GEX client path during       FIPS known-group validation that leads to client-side denial of service       Resolves: RHEL-186435
    - CVE-2026-55654: Fix heap out-of-bounds read during GSSAPI indicator       cleanup due to missing NULL terminator       Resolves: RHEL-185826

Tenable has extracted the preceding description block directly from the Oracle 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 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.

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.

  - scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy     occurs between two remote destinations. (CVE-2026-59996)

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

ID	Name	Product	Family	Type	Severity
335463	Oracle Linux 9 : openssh (ELSA-2026-47756)	Nessus	Oracle Linux Local Security Checks	Local	critical
335338	MiracleLinux 9 : openssh-9.9p1-9.el9_8.ML.1 (AXSA:2026-1533:08)	Nessus	Miracle Linux Local Security Checks	Local	critical
335328	SUSE SLED15: openssh / openssh-askpass-gnome / openssh-clients / openssh-common / etc (SUSE-SU-2026:3605-1)	Nessus	SuSE Local Security Checks	Local	critical
333942	Photon OS 5.0: Openssh PHSA-2026-5.0-92-0926	Nessus	PhotonOS Local Security Checks	Local	critical
333904	Photon OS 5.0: Openssh PHSA-2026-5.0-90-0936	Nessus	PhotonOS Local Security Checks	Local	high
332983	Photon OS 4.0: Openssh PHSA-2026-4.0-1059	Nessus	PhotonOS Local Security Checks	Local	high
332008	Amazon Linux 2023 : openssh, openssh-clients, openssh-keycat (ALAS2023-2026-2031)	Nessus	Amazon Linux Local Security Checks	Local	critical
331582	Photon OS 5.0: Openssh PHSA-2026-5.0-0936	Nessus	PhotonOS Local Security Checks	Local	high
331565	openSUSE 16: openssh / openssh-askpass-gnome / openssh-cavs / openssh-clients / etc (openSUSE-SU-2026:21477-1)	Nessus	SuSE Local Security Checks	Local	critical
331475	AlmaLinux 9 : openssh (ALSA-2026:47756)	Nessus	Alma Linux Local Security Checks	Local	critical
331313	RockyLinux 9 : openssh (RLSA-2026:47756)	Nessus	Rocky Linux Local Security Checks	Local	critical
331288	AlmaLinux 10 : openssh (ALSA-2026:47757)	Nessus	Alma Linux Local Security Checks	Local	critical
331287	Oracle Linux 10 : openssh (ELSA-2026-47757)	Nessus	Oracle Linux Local Security Checks	Local	critical
330864	RHEL 9 : openssh (RHSA-2026:47756)	Nessus	Red Hat Local Security Checks	Local	critical
330850	RHEL 10 : openssh (RHSA-2026:47757)	Nessus	Red Hat Local Security Checks	Local	critical
330844	RockyLinux 10 : openssh (RLSA-2026:47757)	Nessus	Rocky Linux Local Security Checks	Local	critical
328777	Photon OS 5.0: Openssh PHSA-2026-5.0-0926	Nessus	PhotonOS Local Security Checks	Local	critical
328436	Fedora 43 : openssh (2026-169fd93089)	Nessus	Fedora Local Security Checks	Local	critical
328035	CentOS 9 : openssh-9.9p1-10.el9	Nessus	CentOS Local Security Checks	Local	critical
327810	Fedora 44 : openssh (2026-c9d8542bb3)	Nessus	Fedora Local Security Checks	Local	critical
326800	Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSH vulnerabilities (USN-8533-1)	Nessus	Ubuntu Local Security Checks	Local	critical
326244	OpenSSH < 10.4 Multiple Vulnerabilities	Nessus	Misc.	Remote	critical
325685	Linux Distros Unpatched Vulnerability : CVE-2026-59996	Nessus	Misc.	Local	medium

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