{
  "canonical_id": "undici--CVE-2026-1528",
  "system_id": "undici",
  "display_name": "Undici",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "Undici: Malicious WebSocket 64-bit length overflows parser and crashes the client",
  "summary": "### Impact\nA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. \n\n### Patches\n\n\n Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.\n\n### Workarounds\n\nThere are no workarounds.",
  "published_at": "2026-03-13T20:07:26Z",
  "updated_at": "2026-03-14T09:17:45.838435Z",
  "severity": "low",
  "cvss_score": 3.1,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj",
  "secondary_source_urls": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-1528",
    "https://hackerone.com/reports/3537648",
    "https://cna.openjsf.org/security-advisories.html",
    "https://github.com/nodejs/undici"
  ],
  "aliases": [
    "CVE-2026-1528",
    "GHSA-f269-vfmq-vjvj"
  ],
  "cve_ids": [
    "CVE-2026-1528"
  ],
  "ghsa_ids": [
    "GHSA-f269-vfmq-vjvj"
  ],
  "osv_ids": [
    "GHSA-f269-vfmq-vjvj"
  ],
  "affected_versions": [
    "introduced=6.0.0, fixed<6.24.0",
    "introduced=7.0.0, fixed<7.24.0"
  ],
  "fixed_versions": [
    "6.24.0",
    "7.24.0"
  ],
  "package_name": "undici",
  "render_markdown": true,
  "case_path": "07-framework-security/frameworks/undici/cases/undici-cve-2026-1528.md",
  "secure_code_topics": [
    "ssrf-url-validation",
    "proxy-trust-boundary"
  ],
  "status": "generated",
  "triage_reasons": [],
  "metadata": {
    "source_names": [
      "OSV Undici"
    ],
    "source_kinds": [
      "osv-batch"
    ],
    "candidate_count": 1
  }
}