---
title: "CVE-2026-102461: Eclipse Vert.x - Denial of Service"
description: "Eclipse Vert.x 4.0.0 to 4.5.34, 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contains a denial of service caused by inefficient uniqueItems keyword validation in io.vertx:vertx-json-schema, letting remote unauthenticated attackers consume excessive CPU, exploit requires sending a moderately-sized JSON array."
url: https://panop.io/threat-heartbeat/CVE-2026-102461/
---

# CVE-2026-102461 Eclipse Vert.x - Denial of Service

Eclipse Vert.x 4.0.0 to 4.5.34, 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contains a denial of service caused by inefficient uniqueItems keyword validation in io.vertx:vertx-json-schema, letting remote unauthenticated attackers consume excessive CPU, exploit requires sending a moderately-sized JSON array.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102461)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

15 October 2026

Updated

15 October 2026

## Vendor fix

Update to a version later than 4.5.34, 5.0.12, 5.1.9, or 5.2.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/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://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m)
- [https://gitlab.eclipse.org/security/cve-assignment/-/work\_items/340](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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