CVE-2026-102462 Denial of service in Eclipse Vert.x

High 8.2 Published 15 Oct 2026 Updated 15 Oct 2026

A malicious SQL Server can cause an out-of-memory crash in the Vert.x MSSQL client by sending unbounded TDS packets 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-2026-102462?

CVE-2026-102462 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 TDS message decoder in the Vert.x MSSQL client (vertx-mssql-client) aggregates inbound TDS packets into a composite direct-memory buffer without any cumulative size limit. A malicious, compromised, or man-in-the-middle SQL Server can send a continuous stream of TDS packets without setting the END_OF_MESSAGE status flag, 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-mssql-client.

Weakness: CWE-400

Which versions are affected by CVE-2026-102462?

It affects 1 product.

Products include Eclipse Vert.x.

How do I fix CVE-2026-102462?

No fix has been published for CVE-2026-102462 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-2026-102462 being exploited?

There is no known exploitation of CVE-2026-102462 in the wild and no public exploit code.

Sources

Also known as GHSA-fg6c-83v6-vhq4, GHSA-xrjr-rf8w-fphg.