{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-107290",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-07T15:53:23.586Z",
        "datePublished": "2026-10-08T16:09:04.272Z",
        "dateUpdated": "2026-10-09T15:15:26.958Z"
    },
    "containers": {
        "cna": {
            "title": "Pydantic AI: Event loop blocked by quadratic title extraction in `web_fetch`",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1333",
                            "lang": "en",
                            "description": "CWE-1333: Inefficient Regular Expression Complexity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-fpf4-vwcp-v4hp",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-fpf4-vwcp-v4hp"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8397",
                    "tags": [
                        "x_refsource_MISC"
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                    "url": "https://github.com/pydantic/pydantic-ai/pull/8397"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8399",
                    "tags": [
                        "x_refsource_MISC"
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                    "url": "https://github.com/pydantic/pydantic-ai/pull/8399"
                },
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                    "name": "https://github.com/pydantic/pydantic-ai/pull/8418",
                    "tags": [
                        "x_refsource_MISC"
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                    "url": "https://github.com/pydantic/pydantic-ai/pull/8418"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/84332",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/84332"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8434",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/8434"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/2faa6181d8a17d83bc9516d035c5270db8730fa0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/2faa6181d8a17d83bc9516d035c5270db8730fa0"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/9cdc952e4c3319e85a3e04f2de49fbbb765bd38b",
                    "tags": [
                        "x_refsource_MISC"
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                    "url": "https://github.com/pydantic/pydantic-ai/commit/9cdc952e4c3319e85a3e04f2de49fbbb765bd38b"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/a93ea5226be1e93ae13131ae3f22287190411389",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/a93ea5226be1e93ae13131ae3f22287190411389"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/c3fd1cc1f15fdbf750d78e4e3ec1e8b4d6a3d920",
                    "tags": [
                        "x_refsource_MISC"
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                    "url": "https://github.com/pydantic/pydantic-ai/commit/c3fd1cc1f15fdbf750d78e4e3ec1e8b4d6a3d920"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/fb92ccfc3ca2735dab877e2ed73856681bf72ad1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/fb92ccfc3ca2735dab877e2ed73856681bf72ad1"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0"
                }
            ],
            "affected": [
                {
                    "vendor": "pydantic",
                    "product": "pydantic-ai",
                    "versions": [
                        {
                            "version": ">= 1.77.0, < 1.107.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.0.0b1, < 2.44.0",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "pydantic",
                    "product": "pydantic-ai-slim",
                    "versions": [
                        {
                            "version": ">= 1.77.0, < 1.107.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.0.0b1, < 2.44.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-08T16:09:04.272Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback process server-controlled responses with quadratic title extraction, whitespace normalization, and ordered-list numbering. An attacker-controlled page of modest size can therefore block the event loop for an extended period, stalling other agent runs and requests, while unsupported codecs or excessive HTML or JSON nesting can abort an individual run. This issue is fixed in versions 1.107.6 and 2.44.0."
                }
            ],
            "source": {
                "advisory": "GHSA-fpf4-vwcp-v4hp",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-08T20:23:20.403829Z",
                                "id": "CVE-2026-107290",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
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                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-09T15:15:26.958Z"
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        ]
    }
}