Github
CVE-2026-1002
MEDIUM
GHSA-cphf-4846-3xx9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4Blast Radius
ecosystem impact- 141 maven packages depend on io.vertx:vertx-core (122 direct, 19 indirect)
Ecosystem-wide dependent count for version 5.0.0.CR1.
DescriptionCVE.org
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);
AnalysisAI
Improper URI path normalization in Vert.x Web's static file handler allows remote attackers to manipulate the cache and deny access to static files through specially crafted request URIs containing encoded path traversal sequences. An unauthenticated attacker can exploit this vulnerability over the network with no user interaction to cause denial of service by returning HTTP 404 responses for normally accessible files. Public exploit code exists and patches are available.
Technical ContextAI
Classified as CWE-444 (HTTP Request/Response Smuggling). Affects the Vert.x Core component of Vert.X-Web. 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 las
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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Same weakness CWE-444 – HTTP Request/Response Smuggling
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