CVE-2026-33701— OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution

OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution

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.

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可信数据的反序列化

OpenTelemetry Instrumentation for Java 代码问题漏洞

OpenTelemetry Instrumentation for Java是OpenTelemetry开源的一个 Java 代理 JAR。 OpenTelemetry Instrumentation for Java 2.26.1之前版本存在代码问题漏洞，该漏洞源于RMI工具注册的自定义端点反序列化数据时未应用序列化过滤器，可能导致远程代码执行。

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