CVE-2026-33227
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
Apache ActiveMQ Client, Broker, All, and Web contain an improper validation and restriction of a classpath path name vulnerability. An authenticated user-provided 'key' value could be constructed to traverse the classpath due to path concatenation, exposing the application to a classpath resource loading vulnerability that could be chained with other attacks.
Risk Assessment
An authenticated attacker could exploit the classpath traversal to load unauthorized resources, potentially leading to further exploitation when chained with other vulnerabilities.
Recommendation
Upgrade Apache ActiveMQ to version 5.19.4 or 6.2.3 (or later). Ensure the fix is applied, especially on Windows environments.
Other vulnerabilities in Apache ActiveMQ
See all- CVE-2014-3576High
The processControlCommand function in broker/TransportConnection.java in Apache ActiveMQ before version 5.11.0 allows remote attackers to cause a denial of service (shutdown) via a shutdown command.
- CVE-2026-40466High
A vulnerability in Apache ActiveMQ allows an authenticated attacker to bypass the fix for CVE-2026-34197 by adding a connector using HTTP Discovery transport. The attacker can use a malicious HTTP endpoint returning a VM transport, leading to loading a remote Spring XML application context and arbitrary code execution on the broker's JVM.
- CVE-2026-34197HighActively exploited
A vulnerability in Apache ActiveMQ allows an authenticated attacker to achieve remote code execution on the broker via the Jolokia JMX-HTTP endpoint. The attack invokes network connector operations with a crafted URI that loads a remote Spring XML context, leading to arbitrary code execution in the broker's JVM.
- CVE-2015-5254Critical
Apache ActiveMQ 5.x before 5.13.0 does not restrict the classes that can be serialized in the broker, allowing remote attackers to execute arbitrary code via a crafted serialized Java Message Service (JMS) ObjectMessage object.
- CVE-2026-74761High
Improper input validation in TopicRegion in Apache ActiveMQ, Apache ActiveMQ Broker, and Apache ActiveMQ All on all platforms. An authenticated client can spoof clientId when removing a durable topic subscription.
- CVE-2026-61487Medium
Improper authorization in Apache ActiveMQ allows an authenticated low-privilege user to bypass per-destination write ACLs by sending to a temporary composite destination, bypassing the authorization check.
- CVE-2026-59878High
Apache ActiveMQ (versions before 5.19.9 and 6.0.0 before 6.2.8) has a vulnerability in the AMQP NIO component. A remote unauthenticated attacker can send a frame with a specific size, causing NIO threads to die. Rapid repetition can exhaust the NIO thread pool, leading to denial of service.
- CVE-2026-54475High
A missing authorization vulnerability was found in Apache ActiveMQ for temporary destinations. Temporary destinations are expected to be isolated to the connection that created them, but the isolation is only checked on the client side, allowing a different connection to consume from another connection's temporary destination.
- CVE-2026-53917High
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.
- CVE-2026-53916High
A vulnerability in Apache ActiveMQ allows an unauthenticated client to send non-terminating header bytes via STOMP NIO, causing unlimited buffering and JVM heap exhaustion.
Original NVD description (English source)
Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ Web, Apache ActiveMQ. In two instances (when creating a Stomp consumer and also browsing messages in the Web console) an authenticated user provided "key" value could be constructed to traverse the classpath due to path concatenation. As a result, the application is exposed to a classpath path resource loading vulnerability that could potentially be chained together with another attack to lead to exploit. This issue affects Apache ActiveMQ Client: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ Broker: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ All: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ Web: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ: before 5.19.3, from 6.0.0 before 6.2.2. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue. Note: 5.19.3 and 6.2.2 also fix this issue, but that is limited to non-Windows environments due to a path separator resolution bug fixed in 5.19.4 and 6.2.3.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS