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Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding

Type: advisorySource: OSV1 source record

## Summary 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. In `'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. This issue affects grpc: from 0.8.0 before 1.0.0. ## Configurations HTTP-to-gRPC transcoding must be enabled.

Announced Group revision 1
Original source ↗

EEF-CVE-2026-48599

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:EEF-CVE-2026-48599

grpc

Source reference: /affected/0/package/name

Affected versions
0.10.0

Source reference: /affected/0/versions

0.10.1

Source reference: /affected/0/versions

0.10.2

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0.11.0

Source reference: /affected/0/versions

0.11.1

Source reference: /affected/0/versions

0.11.2

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0.11.3

Source reference: /affected/0/versions

0.11.4

Source reference: /affected/0/versions

0.11.5

Source reference: /affected/0/versions

0.8.0

Source reference: /affected/0/versions

0.8.1

Source reference: /affected/0/versions

0.9.0

Source reference: /affected/0/versions

1.0.0-rc.1

Source reference: /affected/0/versions

Fixed versions
1.0.0

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0.8.0"
          },
          {
            "fixed": "1.0.0"
          }
        ]
      }
    ],
    "package": {
      "name": "grpc",
      "purl": "pkg:hex/grpc",
      "ecosystem": "Hex"
    },
    "versions": [
      "0.10.0",
      "0.10.1",
      "0.10.2",
      "0.11.0",
      "0.11.1",
      "0.11.2",
      "0.11.3",
      "0.11.4",
      "0.11.5",
      "0.8.0",
      "0.8.1",
      "0.9.0",
      "1.0.0-rc.1"
    ],
    "database_specific": {
      "source": "https://cna.erlef.org/osv/EEF-CVE-2026-48599.json"
    }
  },
  {
    "ranges": [
      {
        "repo": "https://github.com/elixir-grpc/grpc",
        "type": "GIT",
        "events": [
          {
            "introduced": "8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048"
          },
          {
            "fixed": "33b6a095dbc91c6dee3c7b90893d7d74952e82e4"
          }
        ]
      }
    ],
    "versions": [
      "v0.11.2",
      "v0.8.1",
      "v0.8.0"
    ],
    "database_specific": {
      "source": "https://cna.erlef.org/osv/EEF-CVE-2026-48599.json"
    }
  }
]
Related CVEs
CVE-2026-48599

Source reference: /aliases

Publisher severity

No explicit severity was provided.

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-48599 · High

grpc, grpc

Event
#14319 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. EEF-CVE-2026-48599 · Revision 1Source updated