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MEDIUM

Eclipse Vert.x Web static handler file access denial

Published Jan 15, 2026

Description

The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI.

The issue comes from an improper implementation of the C. rule of section 5.2.4 of RFC3986 and is fixed in Vert.x Core component (used by Vert.x Web): https://github.com/eclipse-vertx/vert.x/pull/5895

Steps to reproduce Given a file served by the static handler, craft an URI that introduces a string like bar%2F..%2F after the last / char to deny the access to the URI with an HTTP 404 response. For example https://example.com/foo/index.html can be denied with https://example.com/foo/bar%2F..%2Findex.html

Mitgation Disabling Static Handler cache fixes the issue.

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

Affected products

Remediation

Red Hat statement

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.

Red Hat mitigation

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); ~~~

Metrics

Weaknesses (1)

CWE-444

References (10)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner eclipse
Published Jan 15, 2026
Updated Jan 15, 2026
Reserved Jan 15, 2026
Link CVE-2026-1002
CISA Vulnrichment
Updated Jan 15, 2026
NVD
Status Analyzed
Modified Jun 17, 2026
Link CVE-2026-1002
Red Hat
Severity Moderate
Public date Jan 15, 2026
Links CVE-2026-1002 - Bugzilla
GHSA-CPHF-4846-3XX9