{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-107287",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-07T15:53:23.586Z",
        "datePublished": "2026-10-08T15:15:05.417Z",
        "dateUpdated": "2026-10-08T15:15:35.042Z"
    },
    "containers": {
        "cna": {
            "title": "Pydantic AI: Excessive resource use when local web fetching converts nested HTML",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-400",
                            "lang": "en",
                            "description": "CWE-400: Uncontrolled Resource Consumption",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-407",
                            "lang": "en",
                            "description": "CWE-407: Inefficient Algorithmic Complexity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cw",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cw"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8984",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/8984"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8985",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/8985"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180c",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180c"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0"
                }
            ],
            "affected": [
                {
                    "vendor": "pydantic",
                    "product": "pydantic-ai",
                    "versions": [
                        {
                            "version": ">= 1.77.0, < 1.107.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.0.0b1, < 2.52.0",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "pydantic",
                    "product": "pydantic-ai-slim",
                    "versions": [
                        {
                            "version": ">= 1.77.0, < 1.107.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.0.0b1, < 2.52.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-08T15:15:35.042Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.7 and 2.52.0, the local web_fetch_tool and the WebFetch local fallback can consume excessive CPU and memory during HTML-to-Markdown conversion of attacker-controlled HTML containing deeply nested block elements. Conversion repeatedly reprocesses accumulated text and can greatly expand intermediate output before the returned-content limit is applied, allowing a model-directed fetch to delay other work in the process. Provider-native web fetching is not affected. This issue is fixed in versions 1.107.7 and 2.52.0."
                }
            ],
            "source": {
                "advisory": "GHSA-v36g-jcw9-x7cw",
                "discovery": "UNKNOWN"
            }
        }
    }
}