CVE-2026-102461

What it is

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

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-10-15 09:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-20 19:29 UTC Last updatedMost recent change to the record

Details

Published

2026-10-15 09:17 UTC

Last modified

2026-10-20 19:29 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-407

Record status

Analyzed

Affected

• Eclipse vert.x < 4.5.35
• Eclipse vert.x < 5.1.10
• Eclipse vert.x 5.2.0

Attack profile CVSS 4.0 · 8.7

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High