{
  "canonical_id": "undici--CVE-2026-22036",
  "system_id": "undici",
  "display_name": "Undici",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion",
  "summary": "### Impact\n\nThe `fetch()` API supports chained HTTP encoding algorithms for response content according to RFC 9110 (e.g., Content-Encoding: gzip, br). This is also supported by the undici decompress interceptor.\n\nHowever, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation.\n\n### Patches\n\nUpgrade to 7.18.2 or 6.23.0.\n\n### Workarounds\n\nIt is possible to apply an undici interceptor and filter long `Content-Encoding` sequences manually.\n\n### References\n\n* https://hackerone.com/reports/3456148\n* https://github.com/advisories/GHSA-gm62-xv2j-4w53\n* https://curl.se/docs/CVE-2022-32206.html",
  "published_at": "2026-01-14T21:06:08Z",
  "updated_at": "2026-02-04T02:56:17.456091Z",
  "severity": "low",
  "cvss_score": 3.1,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/nodejs/undici/security/advisories/GHSA-g9mf-h72j-4rw9",
  "secondary_source_urls": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-22036",
    "https://github.com/nodejs/undici/commit/b04e3cbb569c1596f86c108e9b52c79d8475dcb3",
    "https://github.com/nodejs/undici"
  ],
  "aliases": [
    "CVE-2026-22036",
    "GHSA-g9mf-h72j-4rw9"
  ],
  "cve_ids": [
    "CVE-2026-22036"
  ],
  "ghsa_ids": [
    "GHSA-g9mf-h72j-4rw9"
  ],
  "osv_ids": [
    "GHSA-g9mf-h72j-4rw9"
  ],
  "affected_versions": [
    "introduced=7.0.0, fixed<7.18.2",
    "introduced=0, fixed<6.23.0"
  ],
  "fixed_versions": [
    "7.18.2",
    "6.23.0"
  ],
  "package_name": "undici",
  "render_markdown": true,
  "case_path": "07-framework-security/frameworks/undici/cases/undici-cve-2026-22036.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
  }
}