CVE-2026-82434
Deferred Deferred - Pending Action

Information Disclosure in Apache Storm

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Apache Software Foundation

Description
Description When ZooKeeper authentication is configured, Storm deliberately retains `storm.zookeeper.topology.auth.payload` in the topology configuration, because workers need it. Nimbus then served that configuration verbatim to any caller holding read-only topology permissions, so a user whose only grant was the ability to view a topology received its ZooKeeper credential. That credential is not read-only. The cluster state implementation uses write-capable ACLs for worker heartbeats, backpressure and error state, so a recipient can forge or remove that state for the topology concerned. It is not a write credential on assignments. The same advisory covers the submission client, which logged the generated payload at INFO on every submission that generated one, and the SASL handlers, which logged it at DEBUG. The credential therefore also reached any log aggregation or support bundle collected from the cluster. Mitigation Upgrade to 3.1.0, where the payload is removed from the configuration served to read-only callers and is no longer written to logs. Users who cannot upgrade immediately should rotate `storm.zookeeper.topology.auth.payload` for existing topologies, review retained logs and support bundles for the value, and restrict read-only topology permissions to trusted principals. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-15
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-82434
EUVD
EUVD-2026-77521

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
apache storm 3.1.0
apache storm to 3.1.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-522 The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.
CWE-532 The product writes sensitive information to a log file.

Attack-Flow Graph

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Executive Summary

This vulnerability in Apache Storm (CVE-2026-82434) involves the disclosure of ZooKeeper credentials used for topology authentication. When ZooKeeper authentication is enabled, Storm retains the storm.zookeeper.topology.auth.payload in topology configuration. Nimbus exposes this credential to users with read-only topology permissions, allowing them to view it. The credential has write-capable ACLs, enabling unauthorized users to forge or manipulate topology state such as heartbeats, backpressure, and error states.

Additionally, the credential is logged by the submission client at INFO level and by SASL handlers at DEBUG level, potentially exposing it in logs or support bundles.

Detection Guidance

Check Apache Storm logs for the presence of storm.zookeeper.topology.auth.payload entries. Search for INFO level logs from the submission client and DEBUG level logs from SASL handlers. Verify if Nimbus exposes topology configurations to read-only users.

Impact Analysis

An attacker with read-only access to a topology could obtain ZooKeeper credentials and use them to forge or remove topology state like heartbeats, backpressure, or error states. This could disrupt or destabilize running topologies. The credential may also be exposed in logs or support bundles if not properly secured.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data or system state, violating confidentiality and integrity requirements under GDPR and HIPAA. Exposure of credentials in logs may constitute a data breach, requiring notification and remediation under these regulations.

Mitigation Strategies

Upgrade to Apache Storm version 3.1.0 or later. If upgrading is not possible, rotate the storm.zookeeper.topology.auth.payload credential, review all logs and support bundles for exposure, and restrict read-only topology permissions to trusted principals.

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