Medium 5.3Published Oct 28, 2026

CVE-2026-118259opentelemetry-java: Quadratic CPU consumption in W3C tracestate parsing

Updated under an hour ago (Oct 30, 2026, 6:10 AM ET)

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It affects open-telemetry opentelemetry-java. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 28, 2026
First seen by InfoSec Signals: Oct 28, 2026

Affected products

Affected products

open-telemetry opentelemetry-java open_telemetry:opentelemetry_java (from the name)	before 1.67.0	CNA record

References

References

https://github.com/open-telemetry/opentelemetry-java/security/advisories/GHSA-ccrj-gw8r-854m	x-refsource-confirm
https://github.com/open-telemetry/opentelemetry-java/pull/8914	x-refsource-misc
https://github.com/open-telemetry/opentelemetry-java/commit/ba4dfea91647d1ef596975db5d7197681df3c0f5	x-refsource-misc
https://github.com/open-telemetry/opentelemetry-java/commit/cc4f5f22aed0d69369941cde8029e73507cf438f	x-refsource-misc
https://github.com/open-telemetry/opentelemetry-java/releases/tag/v1.67.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.