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CVE-2026-108748— Quarkus LangChain4j 1.9.0 through 1.14.1 Memory Exhaustion via /_chat/routes WebSocket

Quick assessment

Affected
quarkiverse quarkus-langchain4j
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.

Quarkus LangChain4j 1.9.0 至 1.14.1 版本中存在一个内存释放缺失漏洞，位于聊天作用域（chat-scopes）的 WebSocket 端点。该漏洞允许未认证的远程客户端耗尽服务器内存。攻击者可以通过重复发送 CONNECT 帧并复用同一 chatId，导致 activeScopes 中留下孤立的聊天作用域，直到 JVM 退出并释放内存为止，从而降低服务的可用性。

CVSS 5.3 · Medium EPSS 0.30% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
quarkiverse quarkus-langchain4j 1.9.0≤ 1.14.1 affected
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I. Basic Information for CVE-2026-108748

Vulnerability Information
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Vulnerability Title
Quarkus LangChain4j 1.9.0 through 1.14.1 Memory Exhaustion via /_chat/routes WebSocket
Source: CVE Program / CVE List V5
Vulnerability Description
Quarkus LangChain4j 1.9.0 through 1.14.1 contains a missing release of memory vulnerability in the chat-scopes WebSocket /_chat/routes endpoint that allows unauthenticated remote clients to exhaust server memory. Attackers can send repeated CONNECT frames reusing one chatId, leaving orphaned scopes in activeScopes until the JVM exits and degrading availability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
quarkiverse quarkus-langchain4j 1.9.0 ~ 1.14.1 -

II. Public POCs for CVE-2026-108748

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III. Intelligence Information for CVE-2026-108748

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Patches & Fixes for CVE-2026-108748 (1)

Vendor Advisories for CVE-2026-108748 (1)

News Coverage for CVE-2026-108748 (1)

Other References for CVE-2026-108748 (1)

IV. Related Vulnerabilities

Same vendor: quarkiverse
Same weakness: CWE-401

V. Comments for CVE-2026-108748

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