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CVE-2026-82434: Apache Storm Nimbus

Severity

10 (CRITICAL)

Vendor

APACHE

Affected versions

3.0.0 through before 3.1.0

Fixed version

3.1.0

Patch status

Patched

Published

2026-09-14T15:17:10.453

Modified

2026-09-14T15:17:10.453

Why it matters

This matters because the affected product may allow code execution. Prioritize systems that are internet-facing or have privileged access to other infrastructure.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.
• Review logs for suspicious activity related to the affected application or component.

Technical summary

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.

View the official NVD record for CVE-2026-82434

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.