{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.8.0"
              },
              {
                "fixed": "1.0.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "eda2edc2f43010517b9f7992ccb181792175a17f"
            },
            {
              "fixed": "8105f803030f7f5ae1d722251ee6ab2e36878830"
            },
            {
              "fixed": "33b6a095dbc91c6dee3c7b90893d7d74952e82e4"
            }
          ],
          "repo": "https://github.com/elixir-grpc/grpc",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mwr4-5g34-j5cq"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48599.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048"
          },
          {
            "fixed": "33b6a095dbc91c6dee3c7b90893d7d74952e82e4"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Authorization Bypass Through User-Controlled Key vulnerability in elixir-grpc grpc allows authenticated attackers to access or modify resources belonging to other users by smuggling a conflicting value for any path-bound field via the query string or request body.\n\nIn 'Elixir.GRPC.Server.Transcode':map_request/5 (lib/grpc/server/transcode.ex), all three clauses use Map.merge/2 with path bindings as the first argument, giving them the lowest merge precedence. A request such as GET /users/me/profile?user_id=victim (or a POST with {\"user_id\": \"victim\"} when body: \"*\") yields a decoded protobuf struct where the path-bound field carries the attacker-supplied value rather than the router-extracted value. Any handler that uses the path-bound field for authorization, multi-tenancy scoping, or ownership checks is silently bypassed.\n\nThis issue affects grpc from 0.8.0 before 1.0.0.",
  "id": "CVE-2026-48599",
  "modified": "2026-07-15T01:49:12.648817846Z",
  "published": "2026-06-15T21:55:28.702Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-48599.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-48599"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48599.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48599"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-grpc/grpc/commit/33b6a095dbc91c6dee3c7b90893d7d74952e82e4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elixir-grpc/grpc"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding"
}