ETK-2026-3502Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3502",
  "cve_id": null,
  "display_id": "ETK-2026-3502",
  "ghsa_id": "GHSA-m5vj-8mcw-82qx",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "JSON formatting resource exhaustion in Pydantic AI web fetching",
  "summary": "Pydantic AI local web fetching can consume excessive memory and block other work while processing specially structured JSON responses. Applications are affected when they use web_fetch_tool or the local WebFetch fallback and an attacker can influence a fetched URL; provider-native fetching is not affected.",
  "mitigation": "Upgrade pydantic-ai or pydantic-ai-slim to 1.107.10 or 2.66.0, as appropriate for the deployed release line. Until upgraded, limit local web fetching with allowed_domains to trusted hosts or use provider-native web fetching.",
  "vendor": "pip",
  "product": "pip:pydantic-ai",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.77.0, <= 1.107.9"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "1.107.10"
      ],
      "package_name": "pydantic-ai",
      "purl": "pkg:pypi/pydantic-ai"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.0.0b1, <= 2.65.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "2.66.0"
      ],
      "package_name": "pydantic-ai",
      "purl": "pkg:pypi/pydantic-ai"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.77.0, <= 1.107.9"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "1.107.10"
      ],
      "package_name": "pydantic-ai-slim",
      "purl": "pkg:pypi/pydantic-ai-slim"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.0.0b1, <= 2.65.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "2.66.0"
      ],
      "package_name": "pydantic-ai-slim",
      "purl": "pkg:pypi/pydantic-ai-slim"
    }
  ],
  "cwes": [
    400
  ],
  "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": 13.049183483333334,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-11-04T11:51:35+00:00",
      "days": -0.17468630549768518,
      "is_lower_bound": true,
      "measured_at": "2026-11-04T16:03:07.934234+00:00",
      "url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-m5vj-8mcw-82qx"
    }
  }
}