{"items":[{"id":"NVI-00017837","kind":"vulnerability","title":"gRPC Erlang package's path bindings are overridable by query string and request body","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-mwr4-5g34-j5cq","CVE-2026-48599"],"plain_summary":"GitHub lists this reviewed advisory for grpc. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-7301a0d9f6f2fecef00e99e531bc8a9d"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-7301a0d9f6f2fecef00e99e531bc8a9d","url":"https://github.com/advisories/GHSA-mwr4-5g34-j5cq","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-mwr4-5g34-j5cq","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T09:56:37.775Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7301a0d9f6f2fecef00e99e531bc8a9d"],"technology":"grpc","known_exclusions":[],"conditions_summary":"### Summary\n\nIn the HTTP-to-gRPC transcoding layer of the `grpc` Hex package, query-string and request-body parameters can silently overwrite path-bound fields when building the decoded protobuf request struct. An authenticated attacker who can reach a transcoded endpoint can substitute any path-bound identifier (e.g. `user_id` from `/users/{user_id}/profile`) with an arbitrary value, bypassing authorization, multi-tenancy, and ownership checks that rely on the path-derived field.\n\n### Details\n\nAll three clauses of `GRPC.Server.Transcode.map_request/5` (`grpc_server/lib/grpc/server/transcode.ex`) use `Map.merge/2` with path bindings as the first argument, giving them the lowest merge precedence. Path bindings are extracted by the router from the matched URL template and should be the authoritative resource identifiers, but query-string and body parameters overwrite them. The decoded protobuf struct handed to the handler carries the attacker's value instead of the router's.\n\n### PoC\n\n1. Deploy a transcoded gRPC service with a route like `GET /users/{user_id}/profile` where the handler authorizes access based on `request.user_id`.\n2. Send: `GET /users/me/profile?user_id=victim`\n3. Th","public_affected_ranges":[">= 0.8.0, < 1.0.0"]}],"null_published_at":"2026-11-05T19:10:21.473Z","source_updated_at":"2026-08-25T18:11:17.000Z","source_disclosed_at":"2026-08-25T18:11:15.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T09:56:37.775Z"}],"next_cursor":null,"snapshot_revision":"42594"}