CVE-2026-35337

EUVD-2026-21902

13.04.2026, 10:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	8.8 HIGH	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 50%

Affected Products (NVD)

Vendor	Product	Version
apache	storm	2.0.0 ≤ 𝑥 < 2.8.6

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-502 - Deserialization of Untrusted Data
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

References

https://storm.apache.org/2026/04/12/storm286-released.html

http://www.openwall.com/lists/oss-security/2026/04/12/6