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.
History

Mon, 26 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse eclipse Openj9
Vendors & Products Eclipse
Eclipse eclipse Openj9

Wed, 21 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
Description 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.
Title JITServer: Pre-authentication remote Denial of Service via integer overflow infinite loop in MessageBuffer::computeRequiredCapacity()
Weaknesses CWE-190
CWE-835
References
Metrics cvssV4_0

{'score': 8.7, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published: 2026-10-21T07:57:16.912Z

Updated: 2026-10-26T17:57:35.098Z

Reserved: 2026-10-15T13:44:42.349Z

Link: CVE-2026-111074

cve-icon Vulnrichment

Updated: 2026-10-26T17:50:44.981Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-21T08:16:42.810

Modified: 2026-10-26T18:17:35.633

Link: CVE-2026-111074

cve-icon Redhat

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