ETK-2026-399Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-399",
  "cve_id": null,
  "display_id": "ETK-2026-399",
  "ghsa_id": "GHSA-grj6-jq3x-c5r3",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Stack exhaustion denial of service in jawn-ast JSON rendering",
  "summary": "jawn-ast versions before 1.8.0 can fail while converting sufficiently nested JSON value trees into text. An attacker who can cause an application to render attacker-influenced values may terminate processing threads and, with repeated requests, degrade or deny service.",
  "mitigation": "Upgrade org.typelevel:jawn-ast_2.12, org.typelevel:jawn-ast_2.13, or org.typelevel:jawn-ast_3 to version 1.8.0 or later. Until upgraded, avoid rendering untrusted or unboundedly nested JSON value trees.",
  "vendor": "maven",
  "product": "maven:org.typelevel:jawn-ast_2.13",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 1.7.0"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "1.8.0"
      ],
      "package_name": "org.typelevel:jawn-ast_2.13",
      "purl": "pkg:maven/org.typelevel/jawn-ast_2.13"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 1.7.0"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "1.8.0"
      ],
      "package_name": "org.typelevel:jawn-ast_2.12",
      "purl": "pkg:maven/org.typelevel/jawn-ast_2.12"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 1.7.0"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "1.8.0"
      ],
      "package_name": "org.typelevel:jawn-ast_3",
      "purl": "pkg:maven/org.typelevel/jawn-ast_3"
    }
  ],
  "cwes": [
    674
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 7.0880657,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-10-02T01:20:50+00:00",
      "days": -19.7300864340625,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T18:52:09.741151+00:00",
      "url": "https://github.com/typelevel/jawn/security/advisories/GHSA-grj6-jq3x-c5r3"
    }
  }
}