CVE-2026-102465 Denial of service in Eclipse Vert.x

High 8.2 Published 15 Oct 2026 Updated 15 Oct 2026

A malicious Redis server can cause a denial of service in Vert.x applications by triggering excessive memory allocation via crafted RESP responses.

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-2026-102465?

CVE-2026-102465 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 Vert.x Redis client RESP parser pre-allocates arrays to a length declared by the server without enforcing an upper bound. A malicious or compromised Redis server, or an attacker in a man-in-the-middle position, can send a crafted RESP response declaring an extremely large array, push, or attribute length, causing the client to attempt a massive heap allocation. The resulting OutOfMemoryError crashes the Vert.x event loop thread, denying service to all connections and verticles sharing that loop.

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

Weakness: CWE-770

Which versions are affected by CVE-2026-102465?

It affects 1 product.

Products include Eclipse Vert.x.

How do I fix CVE-2026-102465?

No fix has been published for CVE-2026-102465 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-2026-102465 being exploited?

There is no known exploitation of CVE-2026-102465 in the wild and no public exploit code.

Sources

Also known as GHSA-2fhm-447p-jh2m, GHSA-4wf9-p5hg-98w5.