{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.34.0"
              },
              {
                "fixed": "1.107.4"
              },
              {
                "introduced": "2.0.0b1"
              },
              {
                "fixed": "2.28.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "afde1c431371ce24757179ed1cad09af0f382d29"
            },
            {
              "fixed": "f275d5c4c75d9cc96131800099619c5027b62873"
            },
            {
              "introduced": "6001a4549018ad5509f2c11ed6c38d2385159506"
            },
            {
              "fixed": "4096ee8e16353d4252b2a9605b8732f2d0519953"
            }
          ],
          "repo": "https://github.com/pydantic/pydantic-ai",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h4xc-3qfq-jf93"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-352"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107295.json"
  },
  "details": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 1.107.4 and 2.28.0, the Agent.to_web() and clai web development chat endpoint has missing request content-type validation. A website visited by a developer can submit a browser-compatible request to a loopback-hosted chat server, causing the served agent to run and execute tools with the privileges and credentials of the local process; client-relayed approval decisions also leave requires_approval=True tools exposed. Binding to localhost does not prevent a browser page from reaching the loopback address. This issue is fixed in versions 1.107.4 and 2.28.0.",
  "id": "CVE-2026-107295",
  "modified": "2026-10-09T02:30:37.741831927Z",
  "published": "2026-10-08T17:02:36.718Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107295.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pydantic/pydantic-ai/commit/d2690201a1834005d382dbf5c47e0ed94ef8bf46"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pydantic/pydantic-ai/commit/dd2abbdfa029c9ad138e7cc0edd2eaeaf9ed69c0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pydantic/pydantic-ai/pull/7382"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pydantic/pydantic-ai/pull/7383"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.28.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-h4xc-3qfq-jf93"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107295"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "`pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that can trigger agent tool execution"
}