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.

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.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1310-1 advisory.

    - CVE-2026-3731: Denial of Service via out-of-bounds read in SFTP extension name handler (bsc#1259377).

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

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

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by a vulnerability as referenced in the USN-8093-1 advisory.

    It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a     client application queried extension data out of bounds, it could cause the application to crash,     resulting in a denial of service, or exhibit unintended behavior.

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

Note that Nessus has not tested for this issue 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 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)

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

ID	Name	Product	Family	Severity
306680	SUSE SLES12 Security Update : libssh (SUSE-SU-2026:1344-1)	Nessus	SuSE Local Security Checks	medium
306481	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : libssh (SUSE-SU-2026:1310-1)	Nessus	SuSE Local Security Checks	medium
302895	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 : libssh vulnerability (USN-8093-1)	Nessus	Ubuntu Local Security Checks	medium
301503	Linux Distros Unpatched Vulnerability : CVE-2026-3731	Nessus	Misc.	medium

Detections

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CVE-2026-3731

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Tenable Plugins

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