CVE-2026-102466
Description
In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x MySQL client (vertx-mysql-client) pre-allocates an array for column definitions based on a server-declared column count with no upper-bound validation. A malicious or compromised MySQL server, or an attacker with man-in-the-middle positioning, can send a crafted result set packet with an extremely large column count, causing the client to attempt a massive heap allocation. The resulting OutOfMemoryError crashes the Netty event loop thread, causing a complete denial of service for all connections and verticles in the Vert.x application. The impacted component is io.vertx:vertx-mysql-client.
How to fix
- eclipse vert.x4.5.35, 5.1.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| eclipse vert.x | 4.5.0 ≤ v < 4.5.35, 5.0.0 ≤ v < 5.1.10, 5.2.0 | 4.5.35, 5.1.10 |
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Attack Surface Management
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