UBUNTU-CVE-2026-10650 (CVE-2026-10650)
Vulnerability from osv_ubuntu – Published: 2026-06-02 22:16 – Updated: 2026-06-11 13:02 – Source website
VLAI
Details
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.
Severity
5.3 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-test-server",
"binary_version": "1.7.1-1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "1.7.1-1"
},
{
"binary_name": "libwebsockets7",
"binary_version": "1.7.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@1.7.1-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.2-1",
"1.6.0-3",
"1.6.0-4",
"1.6.0-5",
"1.6.1-1",
"1.7.0-1ubuntu1",
"1.7.0-2",
"1.7.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-test-server",
"binary_version": "2.0.3-3build1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "2.0.3-3build1"
},
{
"binary_name": "libwebsockets8",
"binary_version": "2.0.3-3build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@2.0.3-3build1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.3-3",
"2.0.3-3build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-test-server",
"binary_version": "3.2.1-3ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "3.2.1-3ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets15",
"binary_version": "3.2.1-3ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@3.2.1-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.3-3build1",
"3.2.1-3",
"3.2.1-3ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.0.20-2ubuntu1.1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.0.20-2ubuntu1.1"
},
{
"binary_name": "libwebsockets16",
"binary_version": "4.0.20-2ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.0.20-2ubuntu1.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.20-2",
"4.0.20-2ubuntu1",
"4.0.20-2ubuntu1.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-evlib-ev",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-evlib-glib",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-evlib-uv",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets19t64",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.3.3-1.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3.2-4",
"4.3.3-1",
"4.3.3-1.1build1",
"4.3.3-1.1build2",
"4.3.3-1.1build3",
"4.3.3-1.1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-evlib-ev",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-evlib-glib",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-evlib-uv",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets19t64",
"binary_version": "4.3.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.3.5-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3.5-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-evlib-ev",
"binary_version": "4.3.5-3ubuntu1"
},
{
"binary_name": "libwebsockets-evlib-glib",
"binary_version": "4.3.5-3ubuntu1"
},
{
"binary_name": "libwebsockets-evlib-uv",
"binary_version": "4.3.5-3ubuntu1"
},
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.3.5-3ubuntu1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.3.5-3ubuntu1"
},
{
"binary_name": "libwebsockets19t64",
"binary_version": "4.3.5-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.3.5-3ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3.5-1",
"4.3.5-3",
"4.3.5-3ubuntu1"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2026-10650",
"modified": "2026-06-11T13:02:03Z",
"published": "2026-06-02T22:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-10650"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10650"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-10650"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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