{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-107288",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-07T15:53:23.586Z",
        "datePublished": "2026-10-08T15:18:40.047Z",
        "dateUpdated": "2026-10-08T17:28:53.801Z"
    },
    "containers": {
        "cna": {
            "title": "Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-918",
                            "lang": "en",
                            "description": "CWE-918: Server-Side Request Forgery (SSRF)",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1289",
                            "lang": "en",
                            "description": "CWE-1289: Improper Validation of Unsafe Equivalence in Input",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 3.7,
                        "baseSeverity": "LOW",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8407",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/8407"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8409",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/8409"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/pull/8421",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/pull/8421"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284"
                },
                {
                    "name": "https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983"
                },
                {
                    "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": "2026-10-08T15:18:40.047Z"
            },
            "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 compare blocked_domains entries with a URL hostname before both values are normalized to the form used by getaddrinfo. An attacker-influenced model can use an equivalent IDNA spelling, non-ASCII label separator, case variation, or trailing root label that resolves to a blocked host but does not match the configured string, causing the application to fetch that host with its own privileges. allowed_domains fails closed for unmatched spellings, and private-IP and cloud-metadata protections remain effective. This issue is fixed in versions 1.107.6 and 2.44.0."
                }
            ],
            "source": {
                "advisory": "GHSA-22h6-qm39-v87j",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-08T17:28:31.014859Z",
                                "id": "CVE-2026-107288",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-08T17:28:53.801Z"
                }
            }
        ]
    }
}