CVE-2026-82427: Apache Storm Nimbus: Path Traversal as the Supervisor User via Unsanitised Blobstore Map Local Name
Unsanitised topology.blobstore.map local names in Apache Storm enable path traversal writes on supervisors as the supervisor user.
CVE-2026-82427 affects Apache Storm Nimbus (org.apache.storm:storm-server) versions 3.0.0 before 3.1.0, rated important. Topology submitters can choose a local name for each blob in topology.blobstore.map, which AsyncLocalizer and Container.createBlobstoreLinks used to build paths under the topology's working directory without normalisation. Crafted names allow path traversal, letting a submitter create or overwrite files outside the intended directory on supervisors, with symlink handling also affected. Fixed in version 3.1.0.