---
id: "CVE-2026-73098"
kind: "vulnerability"
aliases: ["CVE-2026-73098"]
title: "Apache Juneau: parsing a Class value runs attacker-named static initializers"
severity: "critical"
cvss: 10.0
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["apache-juneau", "java", "jvm", "package"]
not_affected_if: ["juneau-9.2.1-or-later", "no-untrusted-class-input"]
published_at: "2026-11-05T12:17:50+00:00"
first_seen_at: "2026-11-05T12:38:47+00:00"
updated_at: "2026-11-05T12:40:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73098", "first_seen_at": "2026-11-05T12:38:47+00:00"}]
exploit_sources: []
---

# Apache Juneau: parsing a Class value runs attacker-named static initializers

Apache Juneau loads any class named in parsed input with initialization enabled, so a class's static initializer runs. An attacker who can supply input that names a class on the application classpath can trigger code execution, and the impact depends on which classes the deployment contains.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Apache Juneau version in the project's build file (Maven or Gradle dependency for org.apache.juneau).
- Look for Juneau parsing of untrusted input into java.lang.Class properties.

## Fix

- Apache Juneau: upgrade to `9.2.1`.

## Timeline

- 2026-11-05T12:38:47+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-73098

## From the sources

Improper control of dynamically-loaded code vulnerability in Apache Juneau.

When Apache Juneau parses a value into a property of type java.lang.Class (including parameterized forms), the default class swap loaded the named class with initialization enabled, so input naming a class on the application classpath ran that class's static initializer. The impact depends on the classes present in the deployment.

This issue affects Apache Juneau: through 9.2.0.

Users are recommended to upgrade to version 9.2.1, which fixes the issue.

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