Apache Storm Client up to 3.0.x Blob Storage unrestricted upload

Summaryinfo

A vulnerability categorized as critical has been discovered in Apache Storm Client up to 3.0.x. Affected by this issue is some unknown functionality of the component Blob Storage. Executing a manipulation can lead to unrestricted upload. This vulnerability appears as CVE-2026-82428. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apache Storm Client up to 3.0.x. It has been declared as critical. This vulnerability affects an unknown functionality of the component Blob Storage. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Description Dependency artifacts uploaded with `storm jar --artifacts` were stored under a blob key derived only from the Maven coordinate, for example `dep---.jar`. The key was therefore identical for every user of the cluster and predictable in advance. When the blob already existed, the uploader caught `KeyAlreadyExistsException` and silently reused it, with no check that the existing blob's content or owner matched the artifact the submitter had resolved. A user who uploaded a blob under such a key first therefore controlled the bytes that every later submitter of the same coordinate would receive on the worker classpath, resulting in code execution inside another tenant's topology. This affects deployments where more than one principal may create blobs and where the `--artifacts` dependency feature is used. Mitigation Upgrade to 3.1.0, where each uploaded artifact receives a key carrying a freshly generated UUID and a pre-existing blob is no longer silently reused. Note that the corrected key generation is on the SUBMITTING CLIENT, so upgrading the cluster alone does not close this; every client that runs `storm jar --artifacts` must also be upgraded. Operators should audit existing `dep-` blobs for unexpected owners before upgrading. Users who cannot upgrade immediately should avoid the `--artifacts` mechanism in multi-tenant clusters and distribute dependencies inside the topology jar instead. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

The advisory is available at lists.apache.org. This vulnerability was named CVE-2026-82428 since 08/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/14/2026). This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

Upgrading to version 3.1.0 eliminates this vulnerability.

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Productinfo

Vendor

• Apache

Name

• Storm Client

Version

• 3.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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