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Advisory record · GHSA-xw7x-h9fj-p2c7

OpenTelemetry: Unsafe Deserialization in RMI Instrumentation may Lead to Remote Code Execution

CVSS 9.3 CriticalCriticalEPSS 0.0094 · 61st percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 25 Mar 2026, 21:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.opentelemetry.javaagent:opentelemetry-javaagentMaven<2.26.12.26.1
Identifiers
GHSA-xw7x-h9fj-p2c7 · CVE-2026-33701
Weakness (CWE)
CWE-502
Tags
Published
25 Mar 2026
Updated
29 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Opentelemetry-javaagent (io.opentelemetry.javaagent:opentelemetry-javaagent) versions before 2.26.1 are affected. The RMI instrumentation deserialized incoming data without serialization filters, so an attacker with network access to a JMX or RMI port on an instrumented JVM could potentially execute code remotely, provided a gadget-chain-compatible library is on the classpath. Upgrade to version 2.26.1 or later; a workaround is to disable the RMI integration with a system property.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0094, the 61st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.