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

Quick assessment

Affected
open-telemetry opentelemetry-java-instrumentation
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 9.3 · Critical EPSS 0.93% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-telemetry opentelemetry-java-instrumentation < 2.26.1 affected
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I. Basic Information for CVE-2026-33701

Vulnerability Information
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Vulnerability Title
OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
OpenTelemetry Instrumentation for Java 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-java-instrumentation < 2.26.1 -

II. Public POCs for CVE-2026-33701

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10619 chars
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III. Intelligence Information for CVE-2026-33701

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Patches & Fixes for CVE-2026-33701 (2)

Vendor Advisories for CVE-2026-33701 (1)

IV. Related Vulnerabilities

Same product: opentelemetry-java-instrumentation
Same vendor: open-telemetry
Same weakness: CWE-502

V. Comments for CVE-2026-33701

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