Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service

{
  "id": "0270ec78bb2f4cae15e98c79b938ab75d53d5e5e2589ce29c29105a4103ccd6c",
  "url": "https://osv.dev/vulnerability/CVE-2026-44545",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service",
    "summary": "daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.",
    "evidence": "osv:CVE-2026-44545",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44545",
      "aliases": [
        "CVE-2026-44545",
        "GHSA-rrc9-mx66-ffcm",
        "PYSEC-2026-213"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/django/daphne",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ce3e7f6156a29a3604ca0130ddaed488fbd2eeda"
                },
                {
                  "fixed": "c19f2f4301cc0c26fbf7ed2080eace9e76aec3b6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.2.0"
                      },
                      {
                        "last_affected": "4.2.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:djangoproject:daphne:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.2.1",
            "4.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44545.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.277216062Z",
      "provider": "osv",
      "references": [
        "https://github.com/django/daphne/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44545.json",
        "https://github.com/django/daphne/blob/main/CHANGELOG.txt",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44545",
        "https://pypi.org/project/daphne/"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "DSF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44545.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44545",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493857,
  "published_at": "2026-06-03T13:17:42.907+00:00"
}