CVE-2026-50734 Denial of service in Apache ActiveMQ
Unauthenticated attackers can crash the Apache ActiveMQ broker by sending a crafted frame with an excessive size value during pre-authentication negotiation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50734?
CVE-2026-50734 is a high-severity denial of service vulnerability in Apache Activemq, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All.
An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; 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.
Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.
Weakness: CWE-789
Which versions are affected by CVE-2026-50734?
1 open source package ship an affected version, including activemq. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
activemq Bitnami | All versions | 5.19.8, 6.2.7 |
Products include Apache Activemq.
How do I fix CVE-2026-50734?
Upgrade activemq to a fixed version for your release line: 5.19.8 or 6.2.7.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-50734 being exploited?
There is no known exploitation of CVE-2026-50734 in the wild and no public exploit code.
Other vulnerabilities in Apache Activemq
Sources
Also known as BIT-activemq-2026-50734, DEBIAN-CVE-2026-50734, GHSA-7259-vf48-52q3, MINI-qf5w-ghhr-wqxv, MINI-qfch-72r9-9pc2, MINI-xpqf-5fc2-vhg7 and 2 more.