Quarkus Framework HTTP Response Handling Vulnerability Impacting Java Applications
CVE-2025-66560

5.9MEDIUM

Key Information:

Vendor

Quarkusio

Status
Quarkus
Vendor
CVE Published:
7 January 2026

What is CVE-2025-66560?

A flaw exists in the HTTP layer of Quarkus, a framework for Java applications, that affects how response handling is performed. During the process of writing responses, the framework waits for previously sent response chunks to be fully transmitted. If the client connection is interrupted during this time, the associated worker thread is left in a blocked state indefinitely. This can lead to worker thread exhaustion under sustained load, causing performance degradation or even complete application unavailability. The issue has been resolved in later versions 3.31.0, 3.27.2, and 3.20.5. Users are advised to implement health check mechanisms to monitor worker thread pool status to mitigate risks associated with abnormal retention of threads.

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Affected Version(s)

quarkus >= 3.30.0, < 3.31.0 < 3.30.0, 3.31.0

quarkus >= 3.21.0, < 3.27.2 < 3.21.0, 3.27.2

quarkus < 3.20.5 < 3.20.5

References

https://github.com/quarkusio/quarkus/security/advisories/...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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