---
id: CVE-2026-82430
title: >-
  Description


  When launching a Docker or OCI worker, the setuid-root `worker-launcher` first
  changes ownership of the

  entire worker directory to the untrusted topology user, and only afterwards
  reads and acts on the command

  file that the …
summary: >-
  Description


  When launching a Docker or OCI worker, the setuid-root `worker-launcher` first
  changes ownership of the

  entire worker directory to the untrusted topology user, and only afterwards
  reads and acts on the command

  file that the …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-367
vendor: Apache Software Foundation
product: 'org.apache.storm:storm-core'
affected:
  - 'org.apache.storm:storm-core >= 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-2026-82430'
references:
  - url: 'https://lists.apache.org/thread/8d5pkn486p8vrz5klg6onk5r8k9sd9lv'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/13/10'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-14T20:00:33.467479Z'
ingestedAt: '2026-09-14T15:23:07.424Z'
epss: 0.00137
epssPercentile: 0.02501
---

## Overview

Description

When launching a Docker or OCI worker, the setuid-root `worker-launcher` first changes ownership of the
entire worker directory to the untrusted topology user, and only afterwards reads and acts on the command
file that the supervisor wrote into that same directory. The file is opened without `O_NOFOLLOW` and without
re-verifying its owner, so between the ownership change and the read the tenant can replace its contents.

For the Docker path the parsed command is executed with real uid 0, and the command sanitiser is not a
privilege boundary: it admits `-v` with an arbitrary source, `--device`, `--cap-add`, `--security-opt`,
`--user` and `--net`, and copies positional arguments through verbatim. A rewritten file therefore yields an
attacker-authored, root-equivalent container invocation with the host filesystem available.

For the OCI path the same rewrite window applies, and mount validation is structural only, with no
source or destination allow-list, so arbitrary host paths can be bind-mounted read-write into the
container. The `username` field of the command file is likewise attacker-settable and is checked only
against non-root and minimum-uid rules, permitting execution as another tenant's uid.

Mitigation

Upgrade to 3.1.0, where the command file is validated before the ownership change and re-verified on open,
and where mount sources and destinations are constrained by configuration.

Users who cannot upgrade immediately should disable Docker and OCI worker isolation, or restrict topology
submission on affected supervisors to trusted principals. Note that the launcher must be rebuilt and
reinstalled after upgrading.

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.