CVE-2026-53917
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk52th percentile — higher than 52% of all known CVEs
Summary
A vulnerability in Apache ActiveMQ allows an authenticated user to cause a DoS attack on the broker by sending a crafted OpenWire message with an excessive map size value. The lack of size validation during deserialization of message property maps can trigger OOM and crash the broker.
Risk Assessment
The risk is that an authenticated user can remotely cause a denial of service, potentially disrupting systems relying on ActiveMQ and leading to downtime.
Recommendation
Upgrade Apache ActiveMQ to version 5.19.8 or 6.2.7 immediately, as these versions contain the fix for this vulnerability.
Original NVD description (English source)
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker. An authenticated user can cause a broker DoS by sending a crafted OpenWire Message with a large encoded size value for the map. OpenWire message property maps are unmarshaled without size validation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Broker: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.