CVE-2026-73101

Critical

Description

Generation of Error Message Containing Sensitive Information vulnerability in Apache Juneau. The REST server sends the internal exception class and message to clients in a "Thrown" response header on every error response, and can include internal exception messages in the error body, even when stack-trace rendering is disabled. This reveals implementation details to remote clients. This issue affects Apache Juneau: through 9.2.0. Users are recommended to upgrade to version 9.2.1, which fixes the issue.

SeverityCritical

CVSS10.0

Exploit probability—

ProductApache Juneau

PublishedNov 5, 2026

First seenNov 5, 2026

Weakness typeCWE-209CWE-209

How to fix

Update

Apache Software Foundation Apache Juneau9.2.1 or later

Vendor advisories

lists.apache.org/thread.html/j05q7vw08j48o96tdlzcsd4sozx1lyl6

Affected products

Product	Affected versions	Fixed in
Apache Software Foundation Apache Juneau	v < 9.2.1	9.2.1

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