Apache Storm Nimbus: Submitter-Controlled Class Instantiation in Nimbus via a Fail-Open Scheduler Strategy Allowlist

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-82440
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-09 10:17:11 UTC
Updated2026-11-09 11:17:26 UTC
DescriptionDescription Nimbus instantiates the class named by a topology's `topology.scheduler.strategy` when scheduling it. The allowlist intended to constrain that choice, `nimbus.scheduler.strategy.class.whitelist`, was treated as "allow any class" when unset, and it had no entry in the shipped `defaults.yaml`, so unset was the shipped state. An authenticated submitter could therefore cause Nimbus to instantiate any class on the Nimbus classpath that has a no-argument constructor. Storm's own production artifacts contain classes with side effects suitable for this: instantiating `org.apache.storm.testing.InProcessZookeeper` starts a ZooKeeper server with its own threads and sockets and nothing closes it, and `org.apache.storm.LocalCluster` behaves similarly. Repeated submissions therefore consume threads, sockets and memory in the most privileged daemon in the cluster. Mitigation Upgrade to 3.1.0, where an unset allowlist means the strategies shipped with Storm rather than any class. Note that this is a behaviour change: a cluster running an out-of-tree scheduler strategy without an explicit allowlist will have those topologies refused until the class is added to `nimbus.scheduler.strategy.class.whitelist`. The rejection message names the refused class and the configuration key. Users who cannot upgrade immediately should set `nimbus.scheduler.strategy.class.whitelist` explicitly to the strategies they intend to permit.

Risk And Classification

Problem Types: CWE-470 | CWE-470 CWE-470 Use of Externally-Controlled input to select classes or code ('unsafe reflection')

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Storm Nimbus affected 3.0.0 3.1.0 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread.html/hxcyk1vg9qx8bzos8g3kx91nz8d23jgt [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/11/09/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: The ASF using Claude Agents (en)

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