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.
References
| Link | Resource |
|---|---|
| https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh | Vendor Advisory |
| https://gitlab.eclipse.org/security/cve-assignment/-/work_items/342 | Issue Tracking Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
20 Oct 2026, 19:28
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.9 |
| CPE | cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:* cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:* |
|
| First Time |
Eclipse
Eclipse vert.x |
|
| References | () https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh - Vendor Advisory | |
| References | () https://gitlab.eclipse.org/security/cve-assignment/-/work_items/342 - Issue Tracking, Third Party Advisory |
15 Oct 2026, 15:17
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-789 |
15 Oct 2026, 09:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-15 09:17
Updated : 2026-10-20 19:28
NVD link : CVE-2026-102466
Mitre link : CVE-2026-102466
CVE.ORG link : CVE-2026-102466
JSON object : View
Products Affected
eclipse
- vert.x
CWE
CWE-789
Memory Allocation with Excessive Size Value