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vuln-cve/data/2026/48xxx/CVE-2026-48819.json
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{
"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"
}
}
]
}
}