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CVE-2026-33701

Estado: ModificadaCrítica (9.3)—

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.

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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

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

RMI expuesto en red sin autenticación (AV:N, PR:N, UI:N); deserialización insegura (CWE-502) permite RCE. Java 16 y anteriores sin filtros de serialización. Acceso remoto a JMX/RMI → ejecución arbitraria de código con privilegios del proceso JVM.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability Scanning

Tecnologías afectadas (1)

Linuxfoundation — Opentelemetry Instrumentation FOR Java

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-33701",
  "cveTags": [],
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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  "published": "2026-03-27T01:16:19.313",
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  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "OpenTelemetry Java Instrumentation proporciona auto-instrumentación de OpenTelemetry y bibliotecas de instrumentación para Java. En versiones anteriores a la 2.26.1, la instrumentación RMI registró un punto final personalizado que deserializaba los datos entrantes sin aplicar filtros de serialización. En la versión 16 de JDK y anteriores, un atacante con acceso de red a un puerto JMX o RMI en una JVM instrumentada podría explotar esto para lograr potencialmente la ejecución remota de código. Las tres condiciones siguientes deben cumplirse para explotar esta vulnerabilidad: Primero, la instrumentación de OpenTelemetry Java está adjunta como un agente Java ('-javaagent') en Java 16 o anterior. Segundo, el puerto JMX/RMI ha sido configurado explícitamente a través de '-Dcom.sun.management.jmxremote.port' y es accesible por red. Tercero, una biblioteca compatible con cadenas de gadgets está presente en el classpath. Esto resulta en ejecución remota de código arbitraria con los privilegios del usuario que ejecuta la JVM instrumentada. Para JDK &gt;= 17, no se requiere ninguna acción, pero se recomienda encarecidamente la actualización. Para JDK &lt; 17, actualice a la versión 2.26.1 o posterior. Como solución alternativa, establezca la propiedad del sistema '-Dotel.instrumentation.rmi.enabled=false' para deshabilitar la integración RMI."
    }
  ],
  "lastModified": "2026-08-04T13:18:14.353",
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