UnratedFix available

UBUNTU-CVE-2026-10650

Type: advisorySource: OSV1 source record

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.

Announced 2 Jun 2026Source revision 1

Original source ↗

UBUNTU-CVE-2026-10650

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-10650

libwebsockets

Source reference: /affected/0/package/name

Affected versions: 2.0.3-3build1
Source reference: /affected/0/versions
3.2.1-3
Source reference: /affected/0/versions
3.2.1-3ubuntu0.1~esm1
Source reference: /affected/0/versions
Fixed versions: 3.2.1-3ubuntu0.1~esm2
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/1/package/name

Affected versions: 4.0.20-2
Source reference: /affected/1/versions
4.0.20-2ubuntu1
Source reference: /affected/1/versions
4.0.20-2ubuntu1.1
Source reference: /affected/1/versions
Fixed versions: 4.0.20-2ubuntu1.1+esm1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/2/package/name

Affected versions: 4.3.2-4
Source reference: /affected/2/versions
4.3.3-1
Source reference: /affected/2/versions
4.3.3-1.1build1
Source reference: /affected/2/versions
4.3.3-1.1build2
Source reference: /affected/2/versions
4.3.3-1.1build3
Source reference: /affected/2/versions
4.3.3-1.1ubuntu0.1~esm1
Source reference: /affected/2/versions
Fixed versions: 4.3.3-1.1ubuntu0.1~esm2
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/3/package/name

Affected versions: 4.3.5-1
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

libwebsockets

Source reference: /affected/4/package/name

Affected versions: 4.3.5-1
Source reference: /affected/4/versions
4.3.5-3
Source reference: /affected/4/versions
4.3.5-3ubuntu1
Source reference: /affected/4/versions
Fixed versions: 4.3.5-3ubuntu1.1
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.2.1-3ubuntu0.1~esm2"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "2.0.3-3build1",
      "3.2.1-3",
      "3.2.1-3ubuntu0.1~esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10650.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "3.2.1-3ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "3.2.1-3ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets15",
          "binary_version": "3.2.1-3ubuntu0.1~esm2"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.0.20-2ubuntu1.1+esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fjammy",
      "ecosystem": "Ubuntu:Pro:22.04:LTS"
    },
    "versions": [
      "4.0.20-2",
      "4.0.20-2ubuntu1",
      "4.0.20-2ubuntu1.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10650.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "4.0.20-2ubuntu1.1+esm1"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "4.0.20-2ubuntu1.1+esm1"
        },
        {
          "binary_name": "libwebsockets16",
          "binary_version": "4.0.20-2ubuntu1.1+esm1"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.3.3-1.1ubuntu0.1~esm2"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fnoble",
      "ecosystem": "Ubuntu:Pro:24.04:LTS"
    },
    "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"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10650.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-evlib-ev",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-evlib-glib",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-evlib-uv",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        },
        {
          "binary_name": "libwebsockets19t64",
          "binary_version": "4.3.3-1.1ubuntu0.1~esm2"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=questing",
      "ecosystem": "Ubuntu:25.10"
    },
    "versions": [
      "4.3.5-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10650.json"
    },
    "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"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.3.5-3ubuntu1.1"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:deb/ubuntu/libwebsockets?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "4.3.5-1",
      "4.3.5-3",
      "4.3.5-3ubuntu1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-10650.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libwebsockets-evlib-ev",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-evlib-glib",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-evlib-uv",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-test-server",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets-test-server-common",
          "binary_version": "4.3.5-3ubuntu1.1"
        },
        {
          "binary_name": "libwebsockets19t64",
          "binary_version": "4.3.5-3ubuntu1.1"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #22390 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 06:00:54 GMT
Publisher date: Tue, 02 Jun 2026 22:16:00 GMT

Read the original announcement