Vulnerability Description
opentelemetry-java is the Java implementation of the OpenTelemetry API for recording telemetry, and SDK for managing telemetry recorded by the API. Prior to 1.67.0, W3CTraceContextPropagator.extract() uses regex delimiter processing that can exhibit quadratic backtracking while parsing tracestate headers containing long runs of spaces or tabs without a following comma. An unauthenticated attacker whose headers reach extraction can repeatedly block request or event-loop threads and cause excessive CPU consumption, with practical impact bounded by ingress header-size limits, proxy configuration, and threading. This issue is fixed in version 1.67.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/open-telemetry/opentelemetry-java/commit/ba4dfea91647d1ef5969
- https://github.com/open-telemetry/opentelemetry-java/commit/cc4f5f22aed0d6936994
- https://github.com/open-telemetry/opentelemetry-java/pull/8914
- https://github.com/open-telemetry/opentelemetry-java/releases/tag/v1.67.0
- https://github.com/open-telemetry/opentelemetry-java/security/advisories/GHSA-cc
FAQ
What is CVE-2026-118259?
CVE-2026-118259 is a vulnerability with a CVSS score of 5.3 (MEDIUM). opentelemetry-java is the Java implementation of the OpenTelemetry API for recording telemetry, and SDK for managing telemetry recorded by the API. Prior to 1.67.0, W3CTraceContextPropagator.extract()...
How severe is CVE-2026-118259?
CVE-2026-118259 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-118259?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.