CVE-2026-102461

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

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m	Vendor Advisory
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340	Issue Tracking Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:eclipse:vert.x::::::::
	cpe:2.3:a:eclipse:vert.x::::::::
	cpe:2.3:a:eclipse:vert.x:5.2.0:::::::*

History

20 Oct 2026, 19:29

Type	Values Removed	Values Added
CPE		cpe:2.3:a:eclipse:vert.x:::::::: cpe:2.3:a:eclipse:vert.x:5.2.0:::::::*
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.9
References	~~() https://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m -~~	() https://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m - Vendor Advisory
References	~~() https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340 -~~	() https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340 - Issue Tracking, Third Party Advisory
First Time		Eclipse Eclipse vert.x

16 Oct 2026, 19:17

Type	Values Removed	Values Added
CWE		CWE-407

15 Oct 2026, 09:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-15 09:17

Updated : 2026-10-20 19:29

NVD link : CVE-2026-102461

Mitre link : CVE-2026-102461

CVE.ORG link : CVE-2026-102461

JSON object : View

Products Affected

eclipse

vert.x

CWE

CWE-407

Inefficient Algorithmic Complexity

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