Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-10-15T08:23:54 io.vertx/vertx-json-schema: vertx-json-schema: Denial of Service via inefficient uniqueItems array validation 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-606

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

A flaw was found in vertx-json-schema. When validating arrays configured with the uniqueItems keyword, the validation mechanism performs repetitive pairwise comparisons without an array size limit. A remote, unauthenticated attacker can exploit this vulnerability by submitting a crafted JSON array, leading to excessive CPU consumption and a Denial of Service (DoS).

An IMPORTANT severity denial of service flaw was found in the Eclipse Vert.x vertx-json-schema library, which is shipped in affected Red Hat offerings that carry the io.vertx:vertx-json-schema dependency, including Red Hat Integration and affected Insights and cloud-services components. When vertx-json-schema validates a JSON array whose schema uses the uniqueItems keyword, the validation performs an O(n²) pairwise comparison loop with no short-circuit or array size limit. A remote, unauthenticated attacker can submit a moderately-sized crafted JSON array to an endpoint that applies such schema validation, causing disproportionate CPU consumption that blocks the Vert.x event loop and results in denial of service. Only availability is affected; there is no impact on confidentiality or integrity. The affected Red Hat offerings are recorded as AFFECTED with resolution DELEGATED, and a fix is being pursued for them. The upstream CVE record scores this flaw 8.7 (CVSS 4.0) while Red Hat assigns 7.5 (CVSS 3.1, IMPORTANT); both scores reflect the same remotely exploitable, availability-only impact that requires no privileges or user interaction. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat build of Apicurio Registry 3 Affected vertx-json-schema https://www.cve.org/CVERecord?id=CVE-2026-102461 https://nvd.nist.gov/vuln/detail/CVE-2026-102461 https://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340