CVE-2026-1002

A flaw was found in Vert.x. The Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URIs, preventing legitimate users from accessing static files with an HTTP 404 response.

This vulnerability allows a remote attacker to block access to specific static files, such as images, CSS or HTML files. However, the underlying Vert.x server, the API endpoints and other non-cached resources are not affected. Due to this reason, this issue has been rated with a moderate severity.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this vulnerability, consider disabling the static handler cache by configuring the StaticHandler instance with setCachingEnabled(false), for example:

StaticHandler staticHandler = StaticHandler.create().setCachingEnabled(false);