---
title: "CVE-2026-102466: Eclipse Vert.x - Denial of Service"
description: "Eclipse Vert.x versions 4.0.0 to 4.5.34, 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contain a denial of service caused by lack of upper-bound validation on server-declared column count in vertx-mysql-client, letting attackers cause OutOfMemoryError and crash the event loop, exploit requires man-in-the-middle or malicious MySQL server."
url: https://panop.io/threat-heartbeat/CVE-2026-102466/
---

# CVE-2026-102466 Eclipse Vert.x - Denial of Service

Eclipse Vert.x versions 4.0.0 to 4.5.34, 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contain a denial of service caused by lack of upper-bound validation on server-declared column count in vertx-mysql-client, letting attackers cause OutOfMemoryError and crash the event loop, exploit requires man-in-the-middle or malicious MySQL server.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102466)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

15 October 2026

Updated

15 October 2026

Weakness

[CWE-789](https://cwe.mitre.org/data/definitions/789.html)

## Vendor fix

Update to a version later than 4.5.34, 5.0.12, 5.1.9, or 5.2.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-102466](https://nvd.nist.gov/vuln/detail/CVE-2026-102466)
- [https://gitlab.eclipse.org/security/cve-assignment/-/work\_items/342](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/342)
- [https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh](https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)