CVE-2026-102461 Denial of service in Eclipse Vert.x

High 8.7 Published 15 Oct 2026 Updated 16 Oct 2026

Remote attackers can cause denial of service in Eclipse Vert.x applications by submitting JSON arrays that trigger inefficient O(n²) validation loops.

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-2026-102461?

CVE-2026-102461 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 uniqueItems keyword validation uses an O(n²) pairwise comparison loop with no short-circuit or size limit. A remote unauthenticated attacker can submit a moderately-sized JSON array that consumes disproportionate CPU time, leading to denial of service.

The impacted component is io.vertx:vertx-json-schema.

The following Vert.x modules depend on vertx-json-schema and are also affected:

io.vertx:vertx-web-openapi-router io.vertx:vertx-web-validation io.vertx:vertx-openapi

Weakness: CWE-407

Which versions are affected by CVE-2026-102461?

It affects 1 product.

Products include Eclipse Vert.x.

How do I fix CVE-2026-102461?

No fix has been published for CVE-2026-102461 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-2026-102461 being exploited?

There is no known exploitation of CVE-2026-102461 in the wild and no public exploit code.

Sources

Also known as GHSA-4m87-8qfr-8p8m, GHSA-5ww7-gp4j-grqp.