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Vulnerability record · CVE-2023-38647 · published 26 July 2023

CVE-2023-38647: Apache helix deserialization of untrusted data vulnerability

Apache · Helix

An attacker can use SnakeYAML to deserialize java.net.URLClassLoader and make it load a JAR from a specified URL, and then deserialize javax.script.ScriptEngineManager to load code using that ClassLoader. This unbounded deserialization can likely lead to remote code execution. The code can be run in Helix REST start and Workflow creation. Affect all the versions lower and include 1.2.0. Affected products: helix-core, helix-rest Mitigation: Short term, stop using any YAML based configuration and workflow creation.                   Long term, all Helix version bumping up to 1.3.0 

9.8 CVSS 3.1 Critical EPSS 2.0% · top 20.5% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.1 base score
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

An attacker can use SnakeYAML to deserialize java.net.URLClassLoader and make it load a JAR from a specified URL, and then deserialize javax.script.ScriptEngineManager to load code using that ClassLoader. This unbounded deserialization can likely lead to remote code execution. The code can be run in Helix REST start and Workflow creation. Affect all the versions lower and include 1.2.0. Affected products: helix-core, helix-rest Mitigation: Short term, stop using any YAML based configuration and workflow creation.                   Long term, all Helix version bumping up to 1.3.0 

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/zyqxhv0lc2z9w3tgr8ttrdy2zfh5jvc4 Mailing List
https://lists.apache.org/thread/zyqxhv0lc2z9w3tgr8ttrdy2zfh5jvc4 Mailing List

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Source: NIST National Vulnerability Database (record CVE-2023-38647), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.