CVE-2026-102466

MediumCVSS 5.9/10Last modified Oct 20, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-789

Affected software

Vendor	Product	Versions
Eclipse Foundation	Eclipse Vert.x	>= 4.0.0, <= 4.5.34; >= 5.0.0, <= 5.0.12; >= 5.1.0, <= 5.1.9; 5.2.0

References

https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqhVendor Advisory
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/342Issue Tracking, Third Party Advisory

Timeline

Published: Oct 15, 2026
Last modified: Oct 20, 2026
NVD status: Analyzed

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