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Moderate severityOSV Advisory· Published Jan 15, 2026· Updated Jan 15, 2026

Eclipse Vert.x Web static handler file access denial

CVE-2026-1002

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);

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.vertx:vertx-coreMaven
< 4.5.244.5.24
io.vertx:vertx-coreMaven
>= 5.0.0.CR1, < 5.0.75.0.7

Affected products

51

Patches

Vulnerability mechanics

References

7

News mentions

0

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