High [CVE-2026-82432] Apache Storm: Description Nimbus validated `topology.blobstore.map` against the calling subject at submission time only
This high-severity Apache Software Foundation advisory covers CVE-2026-82432; related products: Apache Storm.
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Summary
Nimbus validated `topology.blobstore.map` against the calling subject at submission time only. The rebalance
operation accepts configuration overrides and stripped a small set of keys from them, but never re-ran that validation, so a caller authorised to rebalance a topology could introduce a blobstore map entry naming a
blob whose ACL does not grant them access. Supervisors localise whatever key the map names, placing the
blob's contents into the topology's working directory.
The same advisory covers `listBlobs`, which performed no authorization check and passed no subject, unlike the neighbouring `getBlobMeta` and `beginBlobDownload` operations.
It therefore returned every key in the blobstore to any caller able to reach the Nimbus Thrift port, which provides the key names that make the
above practical. On its own the disclosure is metadata only.
Affected product named by the advisory: Apache Storm.
- Apache Storm Nimbus 3.0.0 before 3.1.0
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Mitigation Upgrade to 3.1.0, where rebalance configuration overrides are validated exactly as submission-time configuration is, against the rebalancing caller, and where `listBlobs` applies the configured authorization.
- Users who cannot upgrade immediately should restrict rebalance rights to trusted principals, keeping in mind that membership of a topology's `topology.users` or `topology.groups` confers them.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
More Apache Software Foundation advisories
- CVE-2026-82427Sep 14, 2026Apache Storm: Description A topology's `topology.blobstore.map` lets the submitter choose
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- CVE-2026-82431Sep 14, 2026Apache Storm: Description `SimpleACLAuthorizer` evaluated the user-level command set
- CVE-2026-82433Sep 14, 2026Apache Storm: Description `getNimbusConf` returned the complete daemon configuration
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