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CVE-2026-33701

Linuxfoundation Opentelemetry Instrumentation For Java remote code execution

9.8 CRITICALEPSS 1.11%
  1. Published27 Mar 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linuxfoundation Opentelemetry Instrumentation For Java< 2.26.1

Remediation

Fixed in
Linuxfoundation Opentelemetry Instrumentation For Java≥ 2.26.1

References

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Frequently asked

Is CVE-2026-33701 being actively exploited?

CVE-2026-33701 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.11%.

How severe is CVE-2026-33701?

CVE-2026-33701 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.11% probability of exploitation.

Which products are affected by CVE-2026-33701?

Affected products include Linuxfoundation Opentelemetry Instrumentation For Java.

How do I fix CVE-2026-33701?

Upgrade affected software to a fixed version, for example Linuxfoundation Opentelemetry Instrumentation For Java 2.26.1 or later, then confirm no affected versions remain in your inventory.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.