A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.

According to the versions of the libssh packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    The API function `ssh_get_hexa()` is vulnerable, when 0-lenght     input is provided to this function. This function is used internally     in `ssh_get_fingerprint_hash()` and `ssh_print_hexa()` (deprecated),     which is vulnerable to the same input (length is provided by the     calling application).

    The function is also used internally in the gssapi code for logging     the OIDs received by the server during GSSAPI authentication. This     could be triggered remotely, when the server allows GSSAPI authentication     and logging verbosity is set at least to SSH_LOG_PACKET (3). This     could cause self-DoS of the per-connection daemon process.(CVE-2026-0966)

    A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this     by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation.
    This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected     behavior or lead to a denial of service (DoS) due to application crashes.(CVE-2026-0968)

    A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A     local attacker can exploit this by providing a malicious configuration file or when the system is     misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and     access dangerous files, such as block devices or large system files, which can disrupt normal     operations.(CVE-2026-0965)

    A malicious SCP server can send unexpected paths that could make the     client application override local files outside of working directory.
    This could be misused to create malicious executable or configuration     files and make the user execute them under specific consequences.

    This is the same issue as in OpenSSH, tracked as CVE-2019-6111.(CVE-2026-0964)

    A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts     files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to     inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in     a Denial of Service (DoS) for the client.(CVE-2026-0967)

    A weakness has been identified in libssh up to 0.11.3. The impacted element is the function     sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension     Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may     be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This     patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected     component.(CVE-2026-3731)

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

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

According to the versions of the libssh package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    A malicious SCP server can send unexpected paths that could make the client application override local     files outside of working directory.This could be misused to create malicious executable or configuration     files and make the user execute them under specific consequences.This is the same issue as in OpenSSH,     tracked as CVE-2019-6111.(CVE-2026-0964)

    A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A     local attacker can exploit this by providing a malicious configuration file or when the system is     misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and     access dangerous files, such as block devices or large system files, which can disrupt normal     operations.(CVE-2026-0965)

    The API function `ssh_get_hexa()` is vulnerable, when 0-lenght input is provided to this function. This     function is used internally in `ssh_get_fingerprint_hash()` and `ssh_print_hexa()` (deprecated),which is     vulnerable to the same input (length is provided by the     calling application).The function is also used internally in the gssapi code for logging the OIDs received     by the server during GSSAPI authentication. This could be triggered remotely, when the server allows     GSSAPI authentication and logging verbosity is set at least to SSH_LOG_PACKET (3). This could cause self-     DoS of the per-connection daemon process.(CVE-2026-0966)

    A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts     files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to     inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in     a Denial of Service (DoS) for the client.(CVE-2026-0967)

    A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this     by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation.
    This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected     behavior or lead to a denial of service (DoS) due to application crashes.(CVE-2026-0968)

    A weakness has been identified in libssh up to 0.11.3. The impacted element is the function     sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension     Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may     be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This     patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected     component.(CVE-2026-3731)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libssh security advisory.

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

According to the versions of the libssh package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    A weakness has been identified in libssh up to 0.11.3. The impacted element is the function     sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension     Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may     be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This     patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected     component.(CVE-2026-3731)

    A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A     local attacker can exploit this by providing a malicious configuration file or when the system is     misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and     access dangerous files, such as block devices or large system files, which can disrupt normal     operations.(CVE-2026-0965)

    A malicious SCP server can send unexpected paths that could make the client application override local     files outside of working directory.This could be misused to create malicious executable or configuration     files and make the user execute them under specific consequences.This is the same issue as in OpenSSH,     tracked as CVE-2019-6111.(CVE-2026-0964)

    A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts     files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to     inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in     a Denial of Service (DoS) for the client.(CVE-2026-0967)

    The API function `ssh_get_hexa()` is vulnerable, when 0-lenght input is provided to this function. This     function is used internally in `ssh_get_fingerprint_hash()` and `ssh_print_hexa()` (deprecated),which is     vulnerable to the same input (length is provided by the     calling application).The function is also used internally in the gssapi code for logging the OIDs received     by the server during GSSAPI authentication. This could be triggered remotely, when the server allows     GSSAPI authentication and logging verbosity is set at least to SSH_LOG_PACKET (3). This could cause self-     DoS of the per-connection daemon process.(CVE-2026-0966)

    A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this     by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation.
    This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected     behavior or lead to a denial of service (DoS) due to application crashes.(CVE-2026-0968)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libssh security advisory.

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

According to the versions of the libssh package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    libssh: Denial of Service via improper configuration file handling(CVE-2026-0965)

    libssh: Improper sanitation of paths received from SCP servers(CVE-2026-0964)

    libssh: Buffer underflow in ssh_get_hexa() on invalid input(CVE-2026-0966)

    libssh: Denial of Service due to malformed SFTP message(CVE-2026-0968)

    libssh: Denial of Service via inefficient regular expression processing(CVE-2026-0967)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libssh 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-2026:18160 advisory.

    * libssh: Buffer underflow in ssh_get_hexa() on invalid input (CVE-2026-0966)

    * libssh: Improper sanitation of paths received from SCP servers (CVE-2026-0964)

    * libssh: libssh: Denial of Service via improper configuration file handling (CVE-2026-0965)

    * libssh: libssh: Denial of Service via inefficient regular expression processing (CVE-2026-0967)

    * libssh: libssh: Denial of Service due to malformed SFTP message (CVE-2026-0968)

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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:18683 advisory.

    * libssh: Double Free Vulnerability in libssh Key Export Functions (CVE-2025-5351)

    * libssh: Use of uninitialized variable in privatekey_from_file() (CVE-2025-4878)

    * libssh: Write beyond bounds in binary to base64 conversion functions (CVE-2025-4877)

    * libssh: NULL Pointer Dereference in libssh KEX Session ID Calculation (CVE-2025-8114)

    * libssh: Memory Exhaustion via Repeated Key Exchange in libssh (CVE-2025-8277)

    * libssh: Buffer underflow in ssh_get_hexa() on invalid input (CVE-2026-0966)

    * libssh: Improper sanitation of paths received from SCP servers (CVE-2026-0964)

    * libssh: libssh: Denial of Service via improper configuration file handling (CVE-2026-0965)

    * libssh: libssh: Denial of Service via inefficient regular expression processing (CVE-2026-0967)

    * libssh: libssh: Denial of Service due to malformed SFTP message (CVE-2026-0968)

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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:18683 advisory.

    libssh is a library which implements the SSH protocol. It can be used to implement client and server     applications.

    Security Fix(es):

    * libssh: Double Free Vulnerability in libssh Key Export Functions (CVE-2025-5351)

    * libssh: Use of uninitialized variable in privatekey_from_file() (CVE-2025-4878)

    * libssh: Write beyond bounds in binary to base64 conversion functions (CVE-2025-4877)

    * libssh: NULL Pointer Dereference in libssh KEX Session ID Calculation (CVE-2025-8114)

    * libssh: Memory Exhaustion via Repeated Key Exchange in libssh (CVE-2025-8277)

    * libssh: Buffer underflow in ssh_get_hexa() on invalid input (CVE-2026-0966)

    * libssh: Improper sanitation of paths received from SCP servers (CVE-2026-0964)

    * libssh: libssh: Denial of Service via improper configuration file handling (CVE-2026-0965)

    * libssh: libssh: Denial of Service via inefficient regular expression processing (CVE-2026-0967)

    * libssh: libssh: Denial of Service due to malformed SFTP message (CVE-2026-0968)

    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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes     linked from 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-2026:18160 advisory.

    libssh is a library which implements the SSH protocol. It can be used to implement client and server     applications.

    Security Fix(es):

    * libssh: Buffer underflow in ssh_get_hexa() on invalid input (CVE-2026-0966)

    * libssh: Improper sanitation of paths received from SCP servers (CVE-2026-0964)

    * libssh: libssh: Denial of Service via improper configuration file handling (CVE-2026-0965)

    * libssh: libssh: Denial of Service via inefficient regular expression processing (CVE-2026-0967)

    * libssh: libssh: Denial of Service due to malformed SFTP message (CVE-2026-0968)

    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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes     linked from 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 SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:21428-1 advisory.

    - Update to version 0.11.4:
    - CVE-2026-0964: SCP Protocol Path Traversal in ssh_scp_pull_request() (bsc#1258049)
    - CVE-2026-0965: Possible Denial of Service when parsing unexpected configuration files (bsc#1258045)
    - CVE-2026-0966: Buffer underflow in ssh_get_hexa() on invalid input (bsc#1258054)
    - CVE-2026-0967: Specially crafted patterns could cause DoS (bsc#1258081)
    - CVE-2026-0968: OOB Read in sftp_parse_longname() (bsc#1258080)
    - CVE-2025-8114: Fix NULL pointer dereference after allocation failure (bsc#1246974)
    - CVE-2025-8277: Fix memory leak of ephemeral key pair during repeated wrong KEX (bsc#1249375)

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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20647-1 advisory.

    - Update to version 0.11.4:
    - CVE-2026-0964: SCP Protocol Path Traversal in ssh_scp_pull_request() (bsc#1258049)
    - CVE-2026-0965: Possible Denial of Service when parsing unexpected configuration files (bsc#1258045)
    - CVE-2026-0966: Buffer underflow in ssh_get_hexa() on invalid input (bsc#1258054)
    - CVE-2026-0967: Specially crafted patterns could cause DoS (bsc#1258081)
    - CVE-2026-0968: OOB Read in sftp_parse_longname() (bsc#1258080)
    - CVE-2025-8114: Fix NULL pointer dereference after allocation failure (bsc#1246974)
    - CVE-2025-8277: Fix memory leak of ephemeral key pair during repeated wrong KEX (bsc#1249375)

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 SUSE Linux SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1344-1 advisory.

    - CVE-2026-3731: denial of service via out-of-bounds read in SFTP extension name handler (bsc#1259377).
    - CVE-2026-0964: SCP protocol path traversal in `ssh_scp_pull_request()` (bsc#1258049).
    - CVE-2026-0965: possible denial of service when parsing unexpected configuration files (bsc#1258045).
    - CVE-2026-0966: buffer underflow in `ssh_get_hexa()` on invalid input (bsc#1258054).
    - CVE-2026-0967: specially crafted patterns could cause a denial of service (bsc#1258081).
    - CVE-2026-0968: out-of-bounds read in `sftp_parse_longname()` (bsc#1258080).

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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1472 advisory.

    libssh: SCP Protocol Path Traversal in ssh_scp_pull_request() (CVE-2026-0964)

    libssh: Specially crafted patterns could cause DoS (CVE-2026-0967)

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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0779-1 advisory.

    - CVE-2026-0964: improper sanitation of paths received from SCP servers can cause path traversal     (bsc#1258049).
    - CVE-2026-0965: possible denial of service when parsing unexpected configuration files (bsc#1258045).
    - CVE-2026-0966: buffer underflow in ssh_get_hexa() on invalid input (bsc#1258054).
    - CVE-2026-0967: specially crafted patterns could cause denial of service (bsc#1258081).
    - CVE-2026-0968: malformed SFTP message can lead to out of bound read (bsc#1258080).

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 SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0778-1 advisory.

    - CVE-2026-0964: improper sanitation of paths received from SCP servers can cause path traversal     (bsc#1258049).
    - CVE-2026-0965: possible denial of service when parsing unexpected configuration files (bsc#1258045).
    - CVE-2026-0966: buffer underflow in ssh_get_hexa() on invalid input (bsc#1258054).
    - CVE-2026-0967: specially crafted patterns could cause denial of service (bsc#1258081).
    - CVE-2026-0968: malformed SFTP message can lead to out of bound read (bsc#1258080).

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 Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8051-1 advisory.

    It was discovered that libssh clients incorrectly handled the key exchange process. A remote attacker     could possibly use this issue to cause libssh clients to crash, resulting in a denial of service.
    (CVE-2025-8277)

    It was discovered that the libssh SCP client incorrectly sanitized paths received from servers. A remote     attacker could use this issue to cause libssh SCP clients to overwrite files outside of the working     directory and possibly execute arbitrary code. (CVE-2026-0964)

    It was discovered that libssh incorrectly handled parsing configuration files. A local attacker could     possibly use this issue to cause libssh to access non-regular files, resulting in a denial of service.
    (CVE-2026-0965)

    It was discovered that libssh incorrectly handled the ssh_get_hexa() function. A remote attacker could     possibly use this issue to cause libssh to crash, resulting in a denial of service. (CVE-2026-0966)

    It was discovered that libssh incorrectly handled certain regular expressions. A local attacker could     possibly use this issue to cause libssh to consume resources, resulting in a denial of service.
    (CVE-2026-0967)

    It was discovered that the libssh SFTP client incorrectly handled certain malformed longname fields. A     remote attacker could use this issue to cause libssh SFTP clients to crash, resulting in a denial of     service, or possibly execute arbitrary code. (CVE-2026-0968)

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 libssh installed on the remote host is prior to 0.11.4 / 0.12.0. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-047-01 advisory.

    New libssh packages are available for Slackware 15.0 and -current to fix security issues.

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

  - A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts     files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to     inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in     a Denial of Service (DoS) for the client. (CVE-2026-0967)

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

ID	Name	Product	Family	Severity
319979	EulerOS 2.0 SP11 : libssh (EulerOS-SA-2026-2214)	Nessus	Huawei Local Security Checks	medium
319946	EulerOS 2.0 SP11 : libssh (EulerOS-SA-2026-2252)	Nessus	Huawei Local Security Checks	medium
319459	EulerOS Virtualization 2.10.1 : libssh (EulerOS-SA-2026-2027)	Nessus	Huawei Local Security Checks	medium
319452	EulerOS Virtualization 2.12.1 : libssh (EulerOS-SA-2026-2080)	Nessus	Huawei Local Security Checks	medium
319389	EulerOS Virtualization 2.13.0 : libssh (EulerOS-SA-2026-2176)	Nessus	Huawei Local Security Checks	high
319381	EulerOS Virtualization 2.12.0 : libssh (EulerOS-SA-2026-2105)	Nessus	Huawei Local Security Checks	medium
319337	EulerOS Virtualization 2.10.0 : libssh (EulerOS-SA-2026-2054)	Nessus	Huawei Local Security Checks	medium
319324	EulerOS Virtualization 2.13.1 : libssh (EulerOS-SA-2026-2137)	Nessus	Huawei Local Security Checks	high
318292	RockyLinux 10 : libssh (RLSA-2026:18160)	Nessus	Rocky Linux Local Security Checks	high
317435	RockyLinux 9 : libssh (RLSA-2026:18683)	Nessus	Rocky Linux Local Security Checks	high
315440	RHEL 9 : libssh (RHSA-2026:18683)	Nessus	Red Hat Local Security Checks	high
315304	RHEL 10 : libssh (RHSA-2026:18160)	Nessus	Red Hat Local Security Checks	high
312123	SUSE SLES16 Security Update : libssh (SUSE-SU-2026:21428-1)	Nessus	SuSE Local Security Checks	high
311769	openSUSE 16 Security Update : libssh (openSUSE-SU-2026:20647-1)	Nessus	SuSE Local Security Checks	high
306680	SUSE SLES12 Security Update : libssh (SUSE-SU-2026:1344-1)	Nessus	SuSE Local Security Checks	medium
304290	Amazon Linux 2023 : libssh, libssh-config, libssh-devel (ALAS2023-2026-1472)	Nessus	Amazon Linux Local Security Checks	medium
301025	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : libssh (SUSE-SU-2026:0779-1)	Nessus	SuSE Local Security Checks	medium
301023	SUSE SLES12 Security Update : libssh (SUSE-SU-2026:0778-1)	Nessus	SuSE Local Security Checks	medium
299636	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : libssh vulnerabilities (USN-8051-1)	Nessus	Ubuntu Local Security Checks	medium
299277	Slackware Linux 15.0 / current libssh Multiple Vulnerabilities (SSA:2026-047-01)	Nessus	Slackware Local Security Checks	medium
298588	Linux Distros Unpatched Vulnerability : CVE-2026-0967	Nessus	Misc.	medium

Detections

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