CVE-2026-103224 Denial of service in Eclipse Vert.x

High 8.2 Published 15 Oct 2026 Updated 16 Oct 2026

A malicious MySQL server can cause an out-of-memory crash in the Vert.x MySQL client by sending unbounded multi-packet payloads before authentication.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-103224?

CVE-2026-103224 is a high-severity denial of service vulnerability in Eclipse Vert.x, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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 MySQL message decoder aggregates inbound multi-packet payloads into a composite direct-memory buffer without any cumulative size limit. A malicious, compromised, or man-in-the-middle MySQL server can send a continuous stream of packets with the maximum payload length (0xFFFFFF), preventing the end-of-message condition from being reached, causing unbounded direct-memory allocation on the client and leading to an out-of-memory crash. This occurs before authentication completes.

The impacted component is io.vertx:vertx-mysql-client.

Weakness: CWE-789

Which versions are affected by CVE-2026-103224?

It affects 1 product.

Products include Eclipse Vert.x.

How do I fix CVE-2026-103224?

No fix has been published for CVE-2026-103224 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-103224 being exploited?

There is no known exploitation of CVE-2026-103224 in the wild and no public exploit code.

Sources

Also known as GHSA-75hv-9xj3-3cr8, GHSA-cgg9-2xfr-r5vj.