---
id: CVE-2026-82439
title: >-
  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
summary: >-
  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. No code path ever removed an entry: request cleanup
  removed the request from its

  queue, and the shu…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-770
vendor: Apache Software Foundation
product: 'org.apache.storm:storm-server'
affected:
  - 'org.apache.storm:storm-server >= 3.0.0 < 3.1.0'
published: '2026-09-14'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:58:48.430'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82439'
references:
  - url: 'https://lists.apache.org/thread/7sgzvv5lzz93jn6vy74qfk105bhmkrzs'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/13/18'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-14T19:51:03.619338Z'
ingestedAt: '2026-09-14T15:23:07.422Z'
epss: 0.00516
epssPercentile: 0.42736
---

## Overview

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. 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, and
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.

Mitigation

Upgrade to 3.1.0, where a function's queue is removed once nothing is waiting in it.

Users who cannot upgrade immediately should configure `drpc.authorizer` so that only trusted principals can
reach the DRPC endpoints, and should ensure the DRPC ports are not reachable from untrusted networks.

Credit

The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.