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CVE-2026-111074— JITServer: Pre-authentication remote Denial of Service via integer overflow infinite loop in MessageBuffer::computeRequiredCapacity()

Quick assessment

Affected
Eclipse Foundation Eclipse OpenJ9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Eclipse OpenJ9 0.63.0 之前的版本中，JITServer 组件存在一个认证前远程拒绝服务漏洞。在处理传入 TCP 连接的前 4 字节长度字段时， 函数发生整数溢出，导致接收编译的工作线程进入无限循环，占用约 100% 的 CPU 资源。未经身份验证的远程攻击者可通过建立少量精心构造的 TCP 连接，耗尽整个工作线程池，从而静默地中断所有已连接客户端 JVM 的编译服务。

CVSS 8.7 · High EPSS 0.42% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse OpenJ9 0.8.0< 0.63 affected
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I. Basic Information for CVE-2026-111074

Vulnerability Information
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Vulnerability Title
JITServer: Pre-authentication remote Denial of Service via integer overflow infinite loop in MessageBuffer::computeRequiredCapacity()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse OpenJ9 0.8.0 ~ 0.63 -

II. Public POCs for CVE-2026-111074

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III. Intelligence Information for CVE-2026-111074

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Patches & Fixes for CVE-2026-111074 (1)

Other References for CVE-2026-111074 (2)

Same Patch Batch · Eclipse Foundation · 2026-10-21 · 3 CVEs total

CVE-2026-111075 8.7 HIGH JITServer: Pre-authentication remote crash via integer underflow and out-of-bounds heap re
CVE-2026-110938 8.7 HIGH JITServer: Multiple Denial of Service vulnerabilities via out-of-bounds heap reads during

IV. Related Vulnerabilities

Same product: Eclipse OpenJ9
Same vendor: Eclipse Foundation
Same weakness: CWE-190

V. Comments for CVE-2026-111074

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