Bug 2452071 (CVE-2026-33701)

Summary:	CVE-2026-33701 io.opentelemetry.javaagent/opentelemetry-javaagent: OpenTelemetry Java Instrumentation: Remote code execution via deserialization vulnerability in RMI
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	asoldano, bbaranow, bmaxwell, bstansbe, dlofthou, istudens, ivassile, iweiss, mosmerov, msvehla, nwallace, pberan, pesilva, pjindal, pmackay, rstancel, smaestri, thjenkin, vdosoudi
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in OpenTelemetry Java Instrumentation. This vulnerability allows a remote attacker with network access to a Java Management Extensions (JMX) or Remote Method Invocation (RMI) port on an instrumented Java Virtual Machine (JVM) running Java Development Kit (JDK) version 16 or earlier to achieve arbitrary remote code execution. This is possible because the RMI instrumentation registers a custom endpoint that deserializes incoming data without proper serialization filters, provided a compatible gadget-chain library is present on the classpath. Successful exploitation grants the attacker the same privileges as the user running the affected JVM.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-03-27 01:02:20 UTC

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.