CVE-2026-40557

Directory traversal vulnerability in the log viewer in Apache Storm 0.9.0.1 allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter to log.

In Apache Storm before 3.1.0, a vulnerability exists: the Netty decoder is installed before authentication and processes frames without verification, allowing an unauthenticated attacker to allocate large buffers and potentially cause memory pressure on workers.

In Apache Storm's SimpleACLAuthorizer, authorization returned early when nimbus.users was empty, skipping evaluation of nimbus.groups. As a result, a cluster restricted by group alone allowed every authenticated principal to perform all user-level operations, including submitTopology, beginFileUpload and getNimbusConf. The issue is fixed in version 3.1.0.

A vulnerability in Apache Storm allows a topology submitter to delete blobs belonging to other topologies by listing their keys in `dependency_jars` and `dependency_artifacts`. Additionally, missing validation can cause Nimbus to fail to retain leadership, rendering the cluster inoperative.

The DRPC server in Apache Storm keeps a map from function names to request queues, and entries are never removed. An attacker can send arbitrary function names without authentication (as `drpc.authorizer` is disabled by default), leading to unbounded memory growth and eventual heap exhaustion.

The UI daemon in Apache Storm 0.10.0 before 0.10.0-beta1 allows remote attackers to execute arbitrary code via unspecified vectors.

Three separate mechanisms in Apache Storm's HTTP components allowed a web page on an unrelated origin to read responses served to an authenticated user. The Logviewer reflected the request's Origin header in Access-Control-Allow-Origin while also sending Access-Control-Allow-Credentials: true, the shared CORS filter was misconfigured (a response header name was supplied where an initialisation parameter name was expected, so the container applied its own credential-allowing defaults), and the UI and Logviewer wrapped API responses in a caller-supplied JSONP callback for every GET request. In each case, a page visited by an authenticated operator can read cluster, topology and log data on their behalf.

When ZooKeeper authentication is configured, Storm deliberately retains storm.zookeeper.topology.auth.payload in the topology configuration, and Nimbus serves that configuration to any caller with read-only topology permissions. A user granted only topology view access receives the ZooKeeper credential, which is write-capable and allows forging or removing topology state. The credential also reaches logs (INFO in the submission client, DEBUG in SASL handlers), and version 3.1.0 removes it from the served configuration and logs.

In Apache Storm before 3.1.0, the getNimbusConf function returns full configuration without redaction, and the UI endpoint /api/v1/cluster/configuration lacks proper authorization, potentially exposing passwords and keys.

In Apache Storm before 3.1.0, the rebalance operation does not revalidate the blobstore map for permissions, and listBlobs lacks authorization checks, allowing an authorized user to access disallowed blobs and disclose metadata.