Vert.x Web static handler component cache can be manipulated to deny the access to static files
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | io.vertx:vertx-core | < 4.5.24, >= 5.0.0.CR1, < 5.0.7 | 4.5.24, 5.0.7 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-1002
- https://github.com/vert-x3/vertx-web/issues/2836
- https://github.com/eclipse-vertx/vert.x/pull/5894
- https://github.com/eclipse-vertx/vert.x/pull/5895
- https://github.com/eclipse-vertx/vert.x/commit/5b67f5d17788b2483d277c760f3f8154f9b2fed0
- https://github.com/eclipse-vertx/vert.x/commit/d007e7b418543eb1567fe95cf20f5450a5c2d047
- https://github.com/eclipse-vertx/vert.x
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L- Weakness (CWE)
CWE-444- Platform
- Java / Kotlin (Maven)
- Package
io.vertx:vertx-core- Disclosed
- 15.01.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-cphf-4846-3xx9 - CC BY 4.0
Vulnerability history: io.vertx:vertx-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 10.2018 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 7
Disclosures per year
- 2018: 3
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 2
- 2025: 0
- 2026: 2
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Vert.x Web static handler component cache can be manipulated to deny the access to static files this entry
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