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CVE-2026-81870— OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs

Quick assessment

Affected
open-telemetry opentelemetry-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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, expor

CVSS 2.0 · Low

Possible ATT&CK Techniques 1 AI

T1120 · Peripheral Device Discovery
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I. Basic Information for CVE-2026-81870

Vulnerability Information
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Vulnerability Title
OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-go >= 1.5.0, < 1.45.0 -

II. Public POCs for CVE-2026-81870

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III. Intelligence Information for CVE-2026-81870

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Patches & Fixes for CVE-2026-81870 (2)

Other References for CVE-2026-81870 (3)

Same Patch Batch · open-telemetry · 2026-09-16 · 4 CVEs total

CVE-2026-81872 6.3 MEDIUM OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full
CVE-2026-81871 6.3 MEDIUM OpenTelemetry-Go: Log gRPC exporter ignores env TLS certs, bypassing mTLS/pinning
CVE-2026-81869 5.1 MEDIUM OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation

IV. Related Vulnerabilities

Same product: opentelemetry-go
Same vendor: open-telemetry
Same weakness: CWE-200

V. Comments for CVE-2026-81870

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