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CVE-2026-102461

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-20
• Weakness: CWE-407

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

Affected products

• Eclipse Foundation Eclipse Vert.x: from 4.5.0 before 4.5.35; from 5.0.0 before 5.1.10; 5.2.0 — fixed in 4.5.35, 5.1.10

How to fix

Upgrade to a fixed version: Eclipse Foundation Eclipse Vert.x 4.5.35, 5.1.10. Check the vendor advisory for mitigations.

References

• https://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340

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