CVE-2026-35337: high-severity vulnerability in Apache Storm Client
Apache Storm Client: RCE through Unsafe Deserialization via Kerberos TGT Credential Handling
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 1.0%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache Storm ClientRelated CVEs — Apache Storm Client
In the same product, most dangerous first.
CVE-2026-82428HIGHApache Storm Client: Cross-Tenant Dependency Jar Substitution via Predictable Blob KeysEPSS 0.7%CVE-2026-82434CRITICALApache Storm Nimbus, Apache Storm Client: Disclosure of the Topology ZooKeeper Credential to Read-Only Users and to LogsEPSS 0.5%CVE-2026-82431CRITICALApache Storm Client: Authorization Bypass When nimbus.groups Is Configured Without nimbus.usersEPSS 0.4%CVE-2026-41081MEDIUMApache Storm Client: Anonymous principal assigned on TLS client certificate verification failureEPSS 0.3%