---
id: CVE-2026-111074
title: >-
  JITServer: Pre-authentication remote Denial of Service via integer overflow
  infinite loop in MessageBuffer::computeRequiredCapacity()
summary: >-
  In Eclipse OpenJ9 versions prior to 0.63.0, the JITServer component is
  vulnerable to a pre-authentication remote denial of service. When processing
  the initial 4-byte length field of an incoming TCP connection, an integer
  overflow in `Me…
severity: high
cvss: 8.7
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-190
  - CWE-835
vendor: Eclipse Foundation
product: Eclipse OpenJ9
affected:
  - eclipse_openj9 >= 0.8.0 < 0.63
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T07:57:16.912Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111074'
references:
  - url: 'https://github.com/eclipse-openj9/openj9/pull/25008'
  - url: 'https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/940'
  - url: 'https://gitlab.eclipse.org/security/cve-assignment/-/work_items/422'
tags:
  - cve.org
ingestedAt: '2026-10-21T08:45:36.246Z'
---

## Overview

In Eclipse OpenJ9 versions prior to 0.63.0, the JITServer component is vulnerable to a pre-authentication remote denial of service. When processing the initial 4-byte length field of an incoming TCP connection, an integer overflow in `MessageBuffer::computeRequiredCapacity()` causes the receiving compilation worker thread to enter an infinite loop consuming ~100% CPU. An unauthenticated remote attacker can exploit this by opening a small number of crafted TCP connections to exhaust the entire worker thread pool, silently halting compilation services for all connected client JVMs.

## Affected

- `eclipse_openj9 >= 0.8.0 < 0.63`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.