Is CVE-2026-73098 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-73098 being exploited in the wild.

How severe is CVE-2026-73098?

Informational severity, published 5 November 2026.

Is there a fix for CVE-2026-73098?

Yes: fixed in 9.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-73098 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-73098?

Check whether you run Apache Juneau at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-73098: Apache Juneau unsafe class loading in deserialization

CVE-2026-73098 · Severity: info · Published 2026-11-05

Apache Juneau is a data serialization library used to convert data formats for application processing. When deserializing untrusted input that specifies a Java class name, Juneau loads and initializes arbitrary classes from the application's classpath, allowing an attacker to execute code embedded in class static initializers. The severity depends on what classes are present in the deployment environment.

Technologies: Apache Juneau. Vendors: Apache.

Quick answers

Is CVE-2026-73098 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-73098 being exploited in the wild.
How severe is CVE-2026-73098?: Informational severity, published 5 November 2026.
Which products and versions are affected?: Apache Juneau through 9.2.0.
Is there a fix for CVE-2026-73098?: Yes: fixed in 9.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-73098 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-73098?: Check whether you run Apache Juneau at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 9.2.1

Technical details

The vulnerability exists in Juneau's handling of java.lang.Class property deserialization, where the default class swap mechanism loads named classes with initialization enabled. An attacker who can control serialized input naming a malicious or gadget class on the classpath can trigger arbitrary code execution via static initializer blocks. This affects versions through 9.2.0 and is fixed in 9.2.1.

Affected products

Apache Juneau through 9.2.0

Timeline

2026-11-05: disclosed

References

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