{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-48819",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-05-22T20:57:10.976Z",
        "datePublished": "2026-07-17T19:46:00.402Z",
        "dateUpdated": "2026-07-20T16:24:20.624Z"
    },
    "containers": {
        "cna": {
            "title": "Hey API: `buildClientParams` template: prototype chain substitution via unknown `$<slot>___proto__` key",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1321",
                            "lang": "en",
                            "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 4.8,
                        "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:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/hey-api/hey-api/security/advisories/GHSA-hhx9-57xq-r5rw",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/hey-api/hey-api/security/advisories/GHSA-hhx9-57xq-r5rw"
                },
                {
                    "name": "https://github.com/hey-api/hey-api/commit/023909137a15eff9c0263d3bcd116140076b214f",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/hey-api/hey-api/commit/023909137a15eff9c0263d3bcd116140076b214f"
                },
                {
                    "name": "https://github.com/hey-api/hey-api/commit/da321a1529eb3c90d2109da870f514b915a60169",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/hey-api/hey-api/commit/da321a1529eb3c90d2109da870f514b915a60169"
                },
                {
                    "name": "https://github.com/hey-api/hey-api/releases/tag/%40hey-api%2Fopenapi-ts%400.97.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/hey-api/hey-api/releases/tag/%40hey-api%2Fopenapi-ts%400.97.3"
                }
            ],
            "affected": [
                {
                    "vendor": "hey-api",
                    "product": "openapi-ts",
                    "versions": [
                        {
                            "version": "< 0.97.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-07-17T19:46:00.402Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Hey API is an ecosystem for turning API specifications into production-ready code. Prior to 0.97.3, dist/clients/core/params.ts ships a runtime template copied into generated SDKs as params.gen.ts, and buildClientParams writes unknown slot-prefixed keys such as $body_, $headers_, $path_, and $query_ directly to the corresponding slot, allowing $query___proto__ alongside a legitimate q field to set params.query through params[\"query\"][\"__proto__\"] = value, call Object.setPrototypeOf(params.query, value), and expose inherited attacker-controlled keys during for..in iteration. This issue is fixed in version 0.97.3."
                }
            ],
            "source": {
                "advisory": "GHSA-hhx9-57xq-r5rw",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/hey-api/hey-api/security/advisories/GHSA-hhx9-57xq-r5rw",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-20T16:23:29.690460Z",
                                "id": "CVE-2026-48819",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "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": "2026-07-20T16:24:20.624Z"
                }
            }
        ]
    }
}