---
id: CVE-2026-110938
title: >-
  JITServer: Multiple Denial of Service vulnerabilities via out-of-bounds heap
  reads during message and reply parsing
summary: >-
  In Eclipse OpenJ9 versions up to 0.63.0, the JITServer component is vulnerable
  to denial of service due to improper boundary checks during protocol message
  and reply handling. An unauthenticated remote attacker or malicious JITServer
  can…
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-125
  - CWE-20
vendor: Eclipse Foundation
product: Eclipse OpenJ9
affected:
  - eclipse_openj9 >= 0.8.0 < 0.63
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T08:03:26.062Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110938'
references:
  - url: 'https://github.com/eclipse-openj9/openj9/pull/25011'
  - url: 'https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/943'
  - url: 'https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/944'
  - url: 'https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/946'
  - url: 'https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/947'
  - url: 'https://gitlab.eclipse.org/security/cve-assignment/-/work_items/407'
tags:
  - cve.org
ingestedAt: '2026-10-21T08:45:36.243Z'
---

## Overview

In Eclipse OpenJ9 versions up to 0.63.0, the JITServer component is vulnerable to denial of service due to improper boundary checks during protocol message and reply handling. An unauthenticated remote attacker or malicious JITServer can transmit malformed network payloads that cause out-of-bounds heap reads, immediately crashing the JITServer daemon or client JVM process via a segmentation fault (SIGSEGV).

## Affected

- `eclipse_openj9 >= 0.8.0 < 0.63`

## Remediation

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