CVE-2026-82434 Description When ZooKeeper authentication is configured, Storm deliberately retains `storm.zookeeper.topology.auth.payload` in the topology
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-82434?
CVE-2026-82434 is a critical vulnerability in Apache Storm Client, published on 14 Sep 2026.
Official 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.
Which versions are affected by CVE-2026-82434?
How do I fix CVE-2026-82434?
No fix has been published for CVE-2026-82434 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82434 being exploited?
There is no known exploitation of CVE-2026-82434 in the wild and no public exploit code.
Sources
Also known as GHSA-6fmw-8rj9-p9pg.