A flaw has been found in warmcat libwebsockets up to 4.5.8. This issue affects the function lws_ssh_parse_plaintext of the file plugins/protocol_lws_ssh_base/sshd.c of the component SSH Protocol Handler. Executing a manipulation of the argument msg_len can lead to resource consumption. The attack may be launched remotely. The exploit has been published and may be used. This patch is called 3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498. A patch should be applied to remediate this issue.

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

    A flaw has been found in warmcat libwebsockets up to 4.5.8. This issue affects the function     lws_ssh_parse_plaintext of the file plugins/protocol_lws_ssh_base/sshd.c of the component SSH Protocol     Handler. Executing a manipulation of the argument msg_len can lead to resource consumption. The attack may     be launched remotely. The exploit has been published and may be used. This patch is called     3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498. A patch should be applied to remediate this     issue.(CVE-2026-10650)

Tenable has extracted the preceding description block directly from the EulerOS libwebsockets 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 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8822-1 advisory.

    It was discovered that Libwebsockets incorrectly handled certain SSH protocol messages in its SSH protocol     handler. A remote attacker could possibly use this issue to cause Libwebsockets to consume excessive     resources, resulting in a denial of service. (CVE-2026-10650)

    It was discovered that Libwebsockets incorrectly handled certain malformed CBOR data. A remote attacker     could possibly use this issue to cause Libwebsockets to crash, resulting in a denial of service, or     execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-78161)

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 remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-59fdef3e5f advisory.

    Update to 4.5.8

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-9921e0e415 advisory.

    Update to 4.5.8

Tenable has extracted the preceding description block directly from the Fedora 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 flaw has been found in warmcat libwebsockets up to 4.5.8. This issue affects the function     lws_ssh_parse_plaintext of the file plugins/protocol_lws_ssh_base/sshd.c of the component SSH Protocol     Handler. Executing a manipulation of the argument msg_len can lead to resource consumption. The attack may     be launched remotely. The exploit has been published and may be used. This patch is called     3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498. A patch should be applied to remediate this issue.
    (CVE-2026-10650)

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

ID	Name	Product	Family	Type	Severity
363997	EulerOS 2.0 SP15 : libwebsockets (EulerOS-SA-2026-3924)	Nessus	Huawei Local Security Checks	Local	medium
363968	EulerOS 2.0 SP15 : libwebsockets (EulerOS-SA-2026-3990)	Nessus	Huawei Local Security Checks	Local	medium
350921	Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Libwebsockets vulnerabilities (USN-8822-1)	Nessus	Ubuntu Local Security Checks	Local	medium
330083	Fedora 43 : libwebsockets (2026-59fdef3e5f)	Nessus	Fedora Local Security Checks	Local	medium
330053	Fedora 44 : libwebsockets (2026-9921e0e415)	Nessus	Fedora Local Security Checks	Local	medium
318419	Linux Distros Unpatched Vulnerability : CVE-2026-10650	Nessus	Misc.	Local	medium

Detections

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CVE-2026-10650

medium

Tenable Plugins

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medium