Critical 10.0Published Sep 14, 2026

CVE-2026-82434Apache Storm Nimbus, Apache Storm Client: Disclosure of the Topology ZooKeeper Credential to Read-Only Users and to Logs

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects Apache Software Foundation Apache Storm Nimbus and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for Apache Software Foundation Apache Storm Nimbus

Exploited in the last 30 days

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.

CVSS: 10.0 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weakness (CWE): CWE-522, CWE-532
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Deferred
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache Storm Nimbus apache_software_foundation:apache_storm_nimbus (from the name)	from 3.0.0 before 3.1.0	CNA record
Apache Software Foundation Apache Storm Client apache_software_foundation:apache_storm_client (from the name)	from 3.0.0 before 3.1.0	CNA record

References

https://lists.apache.org/thread/1t7hggrz59rdq792qm1pnkqj0ogm2szqvendor-advisory
http://www.openwall.com/lists/oss-security/2026/09/13/14
http://www.openwall.com/lists/oss-security/2026/09/13/23

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.