CVE-2026-54712 in OpenTelemetry Java Instrumentation
OpenTelemetry Java Instrumentation provides OpenTelemetry auto-instrumentation and instrumentation libraries for Java. In versions prior to 2.27.0, the RMI context propagation payload reader limits the number of context entries but does not limit the aggregate size of the strings read from the stream. An attacker who can reach an RMI endpoint on an instrumented JVM can send an oversized context propagation payload. This can cause excessive memory allocation while the JVM reads the payload, potentially leading to denial of service. The issue affects only deployments where RMI instrumentation is enabled and an RMI endpoint is network-reachable. This issue has been fixed in version 2.27.0.
Quick answer
Linux Foundation OpenTelemetry Java Instrumentation should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- OpenTelemetry Java Instrumentation before 2.27.0
Fixed versions
- OpenTelemetry Java Instrumentation 2.27.0 or later
How to fix it
CVE-2026-54712 affects OpenTelemetry Java Instrumentation. The issue means the service may slow down, crash, or use too many resources. Treat it as a priority if this software is reachable by users, admins, browsers, or the network. Update to OpenTelemetry Java Instrumentation 2.27.0 or later, or follow the linked vendor advisory if your branch needs a backport.
- Inventory every OpenTelemetry Java Instrumentation install, package, server, browser, or managed device in use.
- Compare installed versions with the affected range: OpenTelemetry Java Instrumentation before 2.27.0.
- Update to OpenTelemetry Java Instrumentation 2.27.0 or later.
- If you cannot update today, restrict access to trusted users and trusted networks only.
- Review logs for crashes, failed requests, privilege changes, unusual data access, or exploit alerts.
- Rotate secrets, tokens, and passwords if exposure or abuse is suspected.
- Document the update and keep the advisory link with the change record.
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Verify the fix
- Confirm the installed version matches the fixed guidance: OpenTelemetry Java Instrumentation 2.27.0 or later.
- Confirm risky admin, API, browser, or network exposure is reduced.
- Retest the affected workflow after the update or mitigation.
- Review logs again after patching for repeated suspicious activity.
- Run a new Fixnx scan where the affected software is part of the public site.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-54712?
Linux Foundation OpenTelemetry Java Instrumentation versions listed as affected should be reviewed: OpenTelemetry Java Instrumentation before 2.27.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.