{"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","slug":"CVE-2026-111074","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `eclipse_openj9 >= 0.8.0 < 0.63`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}