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      <title>CVE-2026-82441 — Apache Storm Nimbus: Cross-Tenant Blob Deletion and Cluster Denial of Service via Unvalidated Topology Dependency Keys</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-82441</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Storm Nimbus&lt;/p&gt;
&lt;p&gt;Description&lt;/p&gt;
&lt;p&gt;A submitted topology carries two lists of blobstore keys, `dependency_jars` and `dependency_artifacts`,
which the client fills in after uploading the corresponding blobs. Nimbus performed no validation of their
contents on the submission path, yet acts on them in two places.&lt;/p&gt;
&lt;p&gt;During cleanup of a finished topology, Nimbus deletes the keys named in those lists, and the deletion is
performed as the Nimbus subject, for which the blobstore short-circuits its ACL check. A submitter who
listed a key belonging to another topology, such as its `-stormjar.jar`, could therefore cause
that blob to be deleted when their own topology was cleaned up.&lt;/p&gt;
&lt;p&gt;Separately, on acquiring leadership a Nimbus compares the dependency keys of all active topologies against
the blobstore contents and surrenders leadership if any is missing. A single key that does not exist, on a
single active topology, therefore causes every Nimbus to acquire leadership, surrender it and requeue
indefinitely, leaving the cluster without a leader and unable to schedule, clean up or accept submissions.&lt;/p&gt;
&lt;p&gt;Mitigation&lt;/p&gt;
&lt;p&gt;Upgrade to 3.1.0, where a submission is refused unless every entry in both lists is a dependency blob key
and exists in the blobstore.&lt;/p&gt;
&lt;p&gt;Note that this validates new submissions only; a topology stored by an affected version with an invalid list
is unaffected by the upgrade. An operator whose cluster is failing to retain a leader should inspect the
Nimbus log for the dependency keys reported as missing…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Storm Nimbus&lt;/p&gt;
&lt;p&gt;Description&lt;/p&gt;
&lt;p&gt;A submitted topology carries two lists of blobstore keys, `dependency_jars` and `dependency_artifacts`,
which the client fills in after uploading the corresponding blobs. Nimbus performed no validation of their
contents on the submission path, yet acts on them in two places.&lt;/p&gt;
&lt;p&gt;During cleanup of a finished topology, Nimbus deletes the keys named in those lists, and the deletion is
performed as the Nimbus subject, for which the blobstore short-circuits its ACL check. A submitter who
listed a key belonging to another topology, such as its `-stormjar.jar`, could therefore cause
that blob to be deleted when their own topology was cleaned up.&lt;/p&gt;
&lt;p&gt;Separately, on acquiring leadership a Nimbus compares the dependency keys of all active topologies against
the blobstore contents and surrenders leadership if any is missing. A single key that does not exist, on a
single active topology, therefore causes every Nimbus to acquire leadership, surrender it and requeue
indefinitely, leaving the cluster without a leader and unable to schedule, clean up or accept submissions.&lt;/p&gt;
&lt;p&gt;Mitigation&lt;/p&gt;
&lt;p&gt;Upgrade to 3.1.0, where a submission is refused unless every entry in both lists is a dependency blob key
and exists in the blobstore.&lt;/p&gt;
&lt;p&gt;Note that this validates new submissions only; a topology stored by an affected version with an invalid list
is unaffected by the upgrade. An operator whose cluster is failing to retain a leader should inspect the
Nimbus log for the dependency keys reported as missing…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-82441</guid>
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