CVE-2026-102466

Vert.x MySQL Client Denial of Service via Excessive Column Allocation

Published Oct 15, 2026 CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*
cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Title Vert.x MySQL Client Denial of Service via Excessive Column Allocation
Type Values Removed Values Added
First Time appeared Eclipse
Eclipse vert.x
Vendors & Products Eclipse
Eclipse vert.x
Type Values Removed Values Added
Weaknesses CWE-789
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
eclipse
Published
Updated
Oct 15, 2026, 2:24 PM
Reserved
Sep 29, 2026, 8:30 AM
Status
Analyzed
Published
Oct 15, 2026, 9:17 AM
Modified
Oct 20, 2026, 7:28 PM