EUVD-2026-21902
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2Description
Deserialization of Untrusted Data vulnerability in Apache Storm. Versions Affected: before 2.8.6. Description: When processing topology credentials submitted via the Nimbus Thrift API, Storm deserializes the base64-encoded TGT blob using ObjectInputStream.readObject() without any class filtering or validation. An authenticated user with topology submission rights could supply a crafted serialized object in the "TGT" credential field, leading to remote code execution in both the Nimbus and Worker JVMs. Mitigation: 2.x users should upgrade to 2.8.6. Users who cannot upgrade immediately should monkey-patch an ObjectInputFilter allow-list to ClientAuthUtils.deserializeKerberosTicket() restricting deserialized classes to javax.security.auth.kerberos.KerberosTicket and its known dependencies. A guide on how to do this is available in the release notes of 2.8.6. Credit: This issue was discovered by K.
Analysis
Remote code execution in Apache Storm before 2.8.6 allows authenticated users with topology submission rights to execute arbitrary code on Nimbus and Worker JVMs via crafted serialized objects in Kerberos TGT credentials. The vulnerability exploits unsafe deserialization in the Nimbus Thrift API (CWE-502) with CVSS 8.8. …
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Remediation
Within 24 hours: Inventory all Apache Storm deployments and document current versions; confirm whether topology submission is restricted to trusted users only. Within 7 days: Contact Apache Storm project for patched version availability and test 2.8.6 or later in non-production environments; simultaneously implement network-level restrictions limiting Nimbus Thrift API access (port 6627 default) to authorized administrative systems only. …
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