{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.97.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "023909137a15eff9c0263d3bcd116140076b214f"
            },
            {
              "fixed": "da321a1529eb3c90d2109da870f514b915a60169"
            }
          ],
          "repo": "https://github.com/hey-api/hey-api",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-hhx9-57xq-r5rw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48819.json"
  },
  "details": "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 $query___proto__ alongside a legitimate q field to set params.query through params[\"query\"][\"__proto__\"] = value, call Object.setPrototypeOf(params.query, value), and expose inherited attacker-controlled keys during for..in iteration. This issue is fixed in version 0.97.3.",
  "id": "CVE-2026-48819",
  "modified": "2026-07-25T03:56:47.758441212Z",
  "published": "2026-07-17T19:46:00.402Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hey-api/hey-api/releases/tag/%40hey-api%2Fopenapi-ts%400.97.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48819.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/hey-api/hey-api/security/advisories/GHSA-hhx9-57xq-r5rw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48819"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hey-api/hey-api/commit/023909137a15eff9c0263d3bcd116140076b214f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hey-api/hey-api/commit/da321a1529eb3c90d2109da870f514b915a60169"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hey API: `buildClientParams` template: prototype chain substitution via unknown `$\u003cslot\u003e___proto__` key"
}