CVE-2026-59878: Apache ActiveMQ

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Apache ActiveMQ: before 5.19.9 (fixed in 5.19.9); from 6.0.0, before 6.2.8 (fixed in 6.2.8)
• Apache ActiveMQ All: before 5.19.9 (fixed in 5.19.9); from 6.0.0, before 6.2.8 (fixed in 6.2.8)
• Apache ActiveMQ Amqp: before 5.19.9 (fixed in 5.19.9); from 6.0.0, before 6.2.8 (fixed in 6.2.8)

Published 2026-07-28. Last modified 2026-08-05.