Apache Storm Nimbus: Path Traversal as the Supervisor User via Unsanitised Blobstore Map Local Name

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Summary

CVECVE-2026-82427
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 15:17:09 UTC
Updated2026-09-14 16:17:20 UTC
DescriptionDescription A topology's `topology.blobstore.map` lets the submitter choose a local name for each blob that the supervisor localises. That name was used to build a path under the topology's working directory without normalisation, in both `AsyncLocalizer` and `Container.createBlobstoreLinks`, and the symlink helper force-deletes whatever already exists at the target before creating the link. A submitter could therefore use `../` segments to direct that delete-and-symlink operation at an arbitrary path, as the supervisor user, on every node the topology is scheduled onto. The consequences include recursive deletion of supervisor-owned content and planting a symlink that causes a subsequent worker launch to execute attacker-chosen code as another tenant's operating-system user, which defeats the isolation that `supervisor.run.worker.as.user` is intended to provide. Mitigation Upgrade to 3.1.0, where the resolved target must lie inside the expected root at both call sites. Users who cannot upgrade immediately should restrict topology submission to trusted principals, and may reject submissions whose `topology.blobstore.map` entries contain path separators or `..` segments before they reach Nimbus. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

Risk And Classification

Problem Types: CWE-22 | CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Vendor Declared Affected Products

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

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/09/13/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread/o0j51w6m0qdmwypvzfnd8w97s7ysnmyj [email protected] lists.apache.org
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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