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CVE-2026-35337

8.8 · HIGH

Deserialization of Untrusted Data vulnerability in Apache Storm.

Published Apr 13, 2026CWE-502EPSS 1.05%

Overview

CVE-2026-35337 is a high-severity vulnerability. It was published on April 13, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refstorm.apache.org/2026/04/12/storm286-released.htmlRefwww.openwall.com/lists/oss-security/2026/04/12/6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-35337?

CVE-2026-35337 is a high-severity vulnerability. It was published on April 13, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-35337?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-35337?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-35337?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-35337 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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