GHSA-XW7X-H9FJ-P2C7
Vulnerability from github – Published: 2026-03-25 21:27 – Updated: 2026-03-27 21:37
VLAI?
Summary
OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution
Details
In versions prior to 2.26.1, the RMI instrumentation registered a custom endpoint that deserialized incoming data without applying serialization filters. 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:
1. OpenTelemetry Java instrumentation is attached as a Java agent (-javaagent)
2. An RMI endpoint is network-reachable (e.g. JMX remote port, an RMI registry, or any application-exported RMI service)
3. A gadget-chain-compatible library is present on the classpath
Impact
Arbitrary remote code execution with the privileges of the user running the instrumented JVM.
Recommendation
Upgrade to version 2.26.1 or later.
Workarounds
Set the following system property to disable the RMI integration:
-Dotel.instrumentation.rmi.enabled=false
Credits
This vulnerability was responsibly disclosed in coordination with Datadog.
Severity ?
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "io.opentelemetry.javaagent:opentelemetry-javaagent"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.26.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33701"
],
"database_specific": {
"cwe_ids": [
"CWE-502"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-25T21:27:43Z",
"nvd_published_at": "2026-03-27T01:16:19Z",
"severity": "CRITICAL"
},
"details": "In versions prior to 2.26.1, the RMI instrumentation registered a custom endpoint that deserialized incoming data without applying serialization filters. An attacker with network access to a JMX or RMI port on an instrumented JVM could exploit this to potentially achieve remote code execution.\u00a0All three of the following conditions must be true to exploit this vulnerability:\n1. OpenTelemetry Java instrumentation is attached as a Java agent (`-javaagent`)\n2. An RMI endpoint is network-reachable (e.g. JMX remote port, an RMI registry, or any application-exported RMI service)\n3. A gadget-chain-compatible library is present on the classpath\n\n### Impact\nArbitrary remote code execution with the privileges of the user running the instrumented JVM.\n\n### Recommendation\nUpgrade to version 2.26.1 or later.\n\n### Workarounds\nSet the following system property to disable the RMI integration:\n\n```\n-Dotel.instrumentation.rmi.enabled=false\n```\n\n### Credits\nThis vulnerability was responsibly disclosed in coordination with Datadog.",
"id": "GHSA-xw7x-h9fj-p2c7",
"modified": "2026-03-27T21:37:04Z",
"published": "2026-03-25T21:27:43Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/open-telemetry/opentelemetry-java-instrumentation/security/advisories/GHSA-xw7x-h9fj-p2c7"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33701"
},
{
"type": "WEB",
"url": "https://github.com/open-telemetry/opentelemetry-java-instrumentation/commit/9cf4fbaaa9e79226142b2ed42a6f6b4ac0be2197"
},
{
"type": "PACKAGE",
"url": "https://github.com/open-telemetry/opentelemetry-java-instrumentation"
},
{
"type": "WEB",
"url": "https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.26.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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