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CVE-2026-59878— Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All: AMQP NIO negative frame size validation bypass leading to DoS

Quick assessment

Affected
Apache Software Foundation Apache ActiveMQ AMQP
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.

Apache activemq是美国Apache基金会开源的一个消息代理中间件。 Apache ActiveMQ、Apache ActiveMQ AMQP、Apache ActiveMQ All 5.19.9之前版本和6.0.0版本至6.2.8之前版本存在输入验证错误漏洞，该漏洞源于输入验证不当，远程未认证攻击者可利用暴露的AMQP NIO连接器发送帧大小值，导致NIO线程死亡和线程池耗尽，从而触发拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.78% · P56

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Apache Software Foundation Apache ActiveMQ < 5.19.9 affected
6.0.0< 6.2.8 affected
Apache Software Foundation Apache ActiveMQ All < 5.19.9 affected
6.0.0< 6.2.8 affected
Apache Software Foundation Apache ActiveMQ AMQP < 5.19.9 affected
6.0.0< 6.2.8 affected
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I. Basic Information for CVE-2026-59878

Vulnerability Information
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Vulnerability Title
Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All: AMQP NIO negative frame size validation bypass leading to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Input Validation vulnerability in Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All. A remote unauthenticated peer that can reach an exposed AMQP NIO connector can trigger denial-of-service behavior by sending a frame size value. This cause the NIO threads to die and if done rapidly enough can lead to exhaustion of the NIO thread pool denying service to other connections. This issue affects Apache ActiveMQ AMQP: before 5.19.9, from 6.0.0 before 6.2.8; Apache ActiveMQ: before 5.19.9, from 6.0.0 before 6.2.8; Apache ActiveMQ All: before 5.19.9, from 6.0.0 before 6.2.8. Users are recommended to upgrade to version 5.19.9, 6.2.8, or 6.3.0 which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache ActiveMQ 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache activemq是美国Apache基金会开源的一个消息代理中间件。 Apache ActiveMQ、Apache ActiveMQ AMQP、Apache ActiveMQ All 5.19.9之前版本和6.0.0版本至6.2.8之前版本存在输入验证错误漏洞，该漏洞源于输入验证不当，远程未认证攻击者可利用暴露的AMQP NIO连接器发送帧大小值，导致NIO线程死亡和线程池耗尽，从而触发拒绝服务。
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
Apache Software Foundation Apache ActiveMQ AMQP 0 ~ 5.19.9 -
Apache Software Foundation Apache ActiveMQ 0 ~ 5.19.9 -
Apache Software Foundation Apache ActiveMQ All 0 ~ 5.19.9 -

II. Public POCs for CVE-2026-59878

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III. Intelligence Information for CVE-2026-59878

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Mailing List Discussions for CVE-2026-59878 (1)

Same Patch Batch · Apache Software Foundation · 2026-07-28 · 4 CVEs total

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CVE-2026-66299 Apache Tomcat: DoS via WebSocket chat example

IV. Related Vulnerabilities

Same vendor: Apache Software Foundation
Same weakness: CWE-20