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certfr-2026-avi-0379 — Une vulnérabilité a été découverte dans Elastic OpenTelemetry Java. Elle permet à un attaquant de provoquer une exécuti…

2026-10-05T12:25:09.258591+00:00

certfr-2026-avi-0379

EUVD-2026-354277

2026-10-05T12:25:09.258641+00:00

EUVD-2026-354277

fkie_cve-2026-33701

2026-10-05T12:25:09.258656+00:00

OpenTelemetry Java Instrumentation provides OpenTelemetry auto-instrumentation and instrumentation libraries for Java. In versions prior to 2.26.1, the RMI instrumentation registered a custom endpoint that deserialized incoming data without applying serialization filters. On JDK version 16 and earlier, an attacker with network access to a JMX or RMI port on an instrumented JVM could exploit this to potentially achieve remote code execution. All three of the following conditions must be true to exploit this vulnerability: First, OpenTelemetry Java instrumentation is attached as a Java agent (`-javaagent`) on Java 16 or earlier. Second, JMX/RMI port has been explicitly configured via `-Dcom.sun.management.jmxremote.port` and is network-reachable. Third, gadget-chain-compatible library is present on the classpath. This results in arbitrary remote code execution with the privileges of the user running the instrumented JVM. For JDK >= 17, no action is required, but upgrading is strongly encouraged. For JDK < 17, upgrade to version 2.26.1 or later. As a workaround, set the system property `-Dotel.instrumentation.rmi.enabled=false` to disable the RMI integration.

GHSA-xw7x-h9fj-p2c7 — OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution

2026-10-05T12:25:09.258698+00:00

Affected: Maven: io.opentelemetry.javaagent:opentelemetry-javaagent

In versions prior to 2.26.1, the RMI instrumentation registered a custom endpoint that deserialized incoming data without applying serialization filters. An attacker with network access to a JMX or RMI port on an instrumented JVM could exploit this to potentially achieve remote code execution. All three of the following conditions must be true to exploit this vulnerability: 1. OpenTelemetry Java instrumentation is attached as a Java agent (`-javaagent`) 2. An RMI endpoint is network-reachable (e.g. JMX remote port, an RMI registry, or any application-exported RMI service) 3. A gadget-chain-compatible library is present on the classpath

### Impact Arbitrary remote code execution with the privileges of the user running the instrumented JVM.

### Recommendation Upgrade to version 2.26.1 or later.

### Workarounds Set the following system property to disable the RMI integration:

``` -Dotel.instrumentation.rmi.enabled=false ```

### Credits This vulnerability was responsibly disclosed in coordination with Datadog.