CVE-2026-102479
Medium
Description
In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP/1.x decoder uses a canonicalization for well known HTTP headers, the canonicalization process interprets well crafted headers as headers of this list, allowing for instance Content-Xength to be interpeted as Content-Length. This can be exploited for request smuggling purpose. The impacted component is io.vertx:vertx-core.
SeverityMedium
CVSS5.9
Exploit probability—
ProductEclipse Vert.x
PublishedOct 14, 2026
First seenOct 14, 2026
Weakness typeCWE-444CWE-444
How to fix
Update
- eclipse vert.x5.1.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| eclipse vert.x | 5.0.0 ≤ v < 5.1.10, 5.2.0 | 5.1.10 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.