Advisory [CVE-2026-82439] Apache Storm: Description The DRPC server kept a map from function name to request queue and created an entry the first time a function name was seen

The DRPC server kept a map from function name to request queue and created an entry the first time a function name was seen.

No code path ever removed an entry: request cleanup removed the request from its queue, and the shutdown path drained queues, but the queue object and its map entry remained for the life of

the process.

Function names come from the client and are not constrained to functions any topology has registered, so the number of retained entries is bounded only by the number of distinct names an attacker chooses to send,

each retained entry holds the name itself. `drpc.authorizer` is unset by default, so no credentials are

required to reach the endpoint.

The retained state is permanent rather than a transient load spike, so the effect accumulates until the DRPC server exhausts its heap.

Affected product named by the advisory: Apache Storm DRPC.