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.
History

Mon, 02 Nov 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 28 Oct 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Opentelemetry
Opentelemetry opentelemetry-java
Vendors & Products Opentelemetry
Opentelemetry opentelemetry-java

Wed, 28 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title opentelemetry-java: Quadratic CPU consumption in W3C tracestate parsing
Weaknesses CWE-1333
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-28T18:53:25.875Z

Updated: 2026-11-02T20:30:39.997Z

Reserved: 2026-10-27T20:13:55.314Z

Link: CVE-2026-118259

cve-icon Vulnrichment

Updated: 2026-11-02T20:30:32.999Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-28T19:17:30.510

Modified: 2026-11-02T21:17:26.583

Link: CVE-2026-118259

cve-icon Redhat

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