CVE-2026-35337 Apache Storm Client: RCE through Unsafe Deserialization via Kerberos TGT Credential Handling
Authenticated attackers can achieve remote code execution in Nimbus and Worker JVMs by submitting malicious serialized objects via the Kerberos TGT credential field.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-35337?
CVE-2026-35337 is a high-severity unsafe deserialization vulnerability in Apache Storm Client, published on 13 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-35337?
2 open source packages ship an affected version, including org.apache.storm:storm-client. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.storm:storm-client Maven | All versions | 2.8.6 |
org.apache.storm:storm-client Maven | All versions | 2.8.6 |
Products include Apache Storm.
How do I fix CVE-2026-35337?
Upgrade org.apache.storm:storm-client to 2.8.6 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-35337 being exploited?
There is no known exploitation of CVE-2026-35337 in the wild and no public exploit code.
Other vulnerabilities in Apache Storm Client
- CVE-2021-38294 Shell Command Injection Vulnerability in Nimbus Thrift Server
- CVE-2021-40865 Unsafe Pre-Authentication Deserialization In Workers
- CVE-2018-11779 Deserialization of Untrusted Data in Apache Storm
- CVE-2015-3188 Apache Storm remote code execution vulnerability
- CVE-2018-1331 Code execution in org.apache.storm:storm-core
Sources
Also known as GHSA-jf89-3q6q-vcgr.