CVE-2026-102463 Denial of service in Eclipse Vert.x

High 8.2 Published 15 Oct 2026 Updated 15 Oct 2026

A malicious PostgreSQL server can cause a denial of service in Eclipse Vert.x applications by triggering excessive memory allocation via crafted array dimensions.

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-2026-102463?

CVE-2026-102463 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 binary array decoder in vertx-pg-client (DataTypeCodec.binaryDecodeArray) allocates a Java array sized by a server-declared 32-bit dimension count with no upper bound. A malicious or compromised PostgreSQL server, or an on-path attacker intercepting an unencrypted connection, can send a crafted DataRow message with an excessively large array dimension value, causing the client to attempt a multi-gigabyte heap allocation and crash with an OutOfMemoryError.

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

Weakness: CWE-789

Which versions are affected by CVE-2026-102463?

It affects 1 product.

Products include Eclipse Vert.x.

How do I fix CVE-2026-102463?

No fix has been published for CVE-2026-102463 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-2026-102463 being exploited?

There is no known exploitation of CVE-2026-102463 in the wild and no public exploit code.

Sources

Also known as GHSA-fqmh-j4r4-hgmj, GHSA-xqmh-8fhj-48fp.