{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-84380",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-09-01T16:27:58.130Z",
        "datePublished": "2026-09-02T17:58:55.520Z",
        "dateUpdated": "2026-09-02T18:07:36.980Z"
    },
    "containers": {
        "cna": {
            "title": "HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-444",
                            "lang": "en",
                            "description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.6,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/pydantic/httpx2/security/advisories/GHSA-pf96-p4fj-6566",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-pf96-p4fj-6566"
                },
                {
                    "name": "https://github.com/pydantic/httpx2/pull/1137",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/httpx2/pull/1137"
                },
                {
                    "name": "https://github.com/pydantic/httpx2/commit/829b93a2393212996f613e635261f777d9ec6eab",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/httpx2/commit/829b93a2393212996f613e635261f777d9ec6eab"
                },
                {
                    "name": "https://github.com/pydantic/httpx2/releases/tag/v2.11.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/pydantic/httpx2/releases/tag/v2.11.0"
                }
            ],
            "affected": [
                {
                    "vendor": "pydantic",
                    "product": "httpx2",
                    "versions": [
                        {
                            "version": "< 2.11.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-02T17:58:55.520Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, Request._prepare() in src/httpx2/httpx2/_models.py can add a body-derived Content-Length header to a request that already contains a caller-supplied Transfer-Encoding header because its setdefault() processing checks each default header independently rather than treating the two framing headers as mutually exclusive. Fixed-size byte, JSON, form, and known-length multipart bodies can therefore be serialized over HTTP/1.1 with both headers, allowing request smuggling or connection desynchronization when downstream intermediaries disagree about which framing header takes precedence. This issue is fixed in version 2.11.0."
                }
            ],
            "source": {
                "advisory": "GHSA-pf96-p4fj-6566",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-02T18:07:09.850518Z",
                                "id": "CVE-2026-84380",
                                "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": "2026-09-02T18:07:36.980Z"
                }
            }
        ]
    }
}