Critical [CVE-2026-82431] Apache Storm: Description `SimpleACLAuthorizer` evaluated the user-level command set by returning early when `nimbus.users` was empty, before `nimbus.groups` was considered
This critical-severity Apache Software Foundation advisory covers CVE-2026-82431; related products: Apache Storm.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Get an email when Apache Software Foundation publishes the next one.
See Apache Software Foundation's last 90 days of advisories first. Then choose the free weekly digest, or a free month of real-time alerts with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
Summary
`SimpleACLAuthorizer` evaluated the user-level command set by returning early when `nimbus.users` was empty, before `nimbus.groups` was considered.
An operator who restricted cluster access by group alone, leaving `nimbus.users` unset, therefore received no restriction at all: every authenticated principal was permitted
every user-level operation, including `submitTopology`, `beginFileUpload` and `getNimbusConf`.
`docs/SECURITY.md` presents `nimbus.groups` as a supported way to lock down a cluster, so a deployment following the documentation could believe it was restricted while it was not.
The failure is silent; nothing in the logs or the configuration indicates that the group list is being ignored.
Both lists left empty continues to mean that no restriction is configured, which is the shipped default is unchanged.
Affected product named by the advisory: Apache Storm.
- Apache Storm Client 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 `nimbus.groups` is evaluated whether or not `nimbus.users` is set.
- Users who cannot upgrade immediately should additionally populate `nimbus.users` with the intended principals, since a non-empty user list causes the group list to be evaluated on affected versions.
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
- CVE-2026-82428Sep 14, 2026Apache Storm: Description Dependency artifacts uploaded with `storm jar --artifacts` were
- CVE-2026-82429Sep 14, 2026Apache Storm: Description The setuid-root `worker-launcher` binary adjusts ownership
- CVE-2026-82430Sep 14, 2026Apache Storm: Description When launching a Docker or OCI worker, the setuid-root
- CVE-2026-82433Sep 14, 2026Apache Storm: Description `getNimbusConf` returned the complete daemon configuration
- CVE-2026-82432Sep 14, 2026Apache Storm: Description Nimbus validated `topology.blobstore.map` against the calling
Android app · Google Play
Monitor future Apache Software Foundation CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.