Bug 2553091 (CVE-2026-102461)

Summary: CVE-2026-102461 io.vertx/vertx-json-schema: vertx-json-schema: Denial of Service via inefficient uniqueItems array validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: asyoung, ewittman, janstey, jhollowa, kaycoth, nipatil, pantinor, prichard, rkubis, sthirugn
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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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).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-15 08:32:06 UTC 
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