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CVE-2025-66560— Quarkus REST has potential worker thread starvation when HTTP connection is closed while waiting to write

Quick assessment

Affected
quarkusio quarkus
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是Quarkus开源的一个用于编写 Java 应用程序的云原生 (Linux) 容器优先框架。 Quarkus 3.31.0之前版本、3.27.2之前版本和3.20.5之前版本存在安全漏洞，该漏洞源于HTTP层响应处理不当，可能导致工作线程耗尽，引发性能下降或应用完全不可用。

CVSS 5.9 · Medium EPSS 0.38% · P30
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I. Basic Information for CVE-2025-66560

Vulnerability Information
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Vulnerability Title
Quarkus REST has potential worker thread starvation when HTTP connection is closed while waiting to write
Source: CVE Program / CVE List V5
Vulnerability Description
Quarkus is a Cloud Native, (Linux) Container First framework for writing Java applications. Prior to versions 3.31.0, 3.27.2, and 3.20.5, a vulnerability exists in the HTTP layer of Quarkus REST related to response handling. When a response is being written, the framework waits for previously written response chunks to be fully transmitted before proceeding. If the client connection is dropped during this waiting period, the associated worker thread is never released and becomes permanently blocked. Under sustained or repeated occurrences, this can exhaust the available worker threads, leading to degraded performance, or complete unavailability of the application. This issue has been patched in versions 3.31.0, 3.27.2, and 3.20.5. A workaround involves implementing a health check that monitors the status and saturation of the worker thread pool to detect abnormal thread retention early.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Quarkus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Quarkus是Quarkus开源的一个用于编写 Java 应用程序的云原生 (Linux) 容器优先框架。 Quarkus 3.31.0之前版本、3.27.2之前版本和3.20.5之前版本存在安全漏洞，该漏洞源于HTTP层响应处理不当，可能导致工作线程耗尽，引发性能下降或应用完全不可用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
quarkusio quarkus >= 3.30.0, < 3.31.0 -

II. Public POCs for CVE-2025-66560

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III. Intelligence Information for CVE-2025-66560

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Vendor Advisories for CVE-2025-66560 (1)

IV. Related Vulnerabilities

Same product: quarkus
Same vendor: quarkusio
Same weakness: CWE-770

V. Comments for CVE-2025-66560

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