Bug 2535644 (CVE-2026-81870)

Summary: CVE-2026-81870 github.com/open-telemetry/opentelemetry-go: OpenTelemetry-Go: Information disclosure via exporter configuration logging
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenTelemetry-Go. The `sdk/trace.NewTracerProvider` component emits an internal Info-level diagnostic event that recursively includes span processor, exporter, and client configuration. If an application enables OpenTelemetry internal Info logging, a person or system with access to those logs could learn internal collector topology and potentially recover credentials or tokens embedded in Zipkin URL user information or query strings. This vulnerability leads to information disclosure of sensitive configuration data.
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Description OSIDB Bzimport 2026-09-16 20:16:06 UTC 
OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.5.0 to 1.44.0, sdk/trace.NewTracerProvider emits a TracerProvider created internal Info-level diagnostic event whose MarshalLog implementations recursively include span processor, exporter, and client configuration. Applications that call otel.SetLogger to enable OpenTelemetry internal Info logging can therefore record OTLP gRPC and HTTP collector endpoints, the OTLP HTTP Insecure flag, and complete Zipkin collector URLs. A person or system with access to those logs can learn internal collector topology and can recover credentials or tokens embedded in Zipkin URL user information or query strings. The default OpenTelemetry logger does not emit the event, and this path does not log OTLP authentication headers, TLS key material, or span payloads. This issue is fixed in version 1.45.0.