---
id: CVE-2026-81870
title: OpenTelemetry-Go is the Go implementation of OpenTelemetry
summary: >-
  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
  includ…
severity: low
cvss: 2
cvssVector: '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'
cwe:
  - CWE-200
  - CWE-532
vendor: open-telemetry
product: opentelemetry-go
affected:
  - 'opentelemetry-go >= 1.5.0, < 1.45.0'
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T15:16:52.953'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81870'
references:
  - url: >-
      https://github.com/open-telemetry/opentelemetry-go/commit/3a1412d2b3bc4e4231fbeac2ed42117ae541bb38
    label: security-advisories@github.com
  - url: 'https://github.com/open-telemetry/opentelemetry-go/pull/8438'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-go/releases/tag/exporters/zipkin/v1.45.0
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.45.0
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-8wmf-6v46-5gfg
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-8wmf-6v46-5gfg
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81870'
  - url: 'https://github.com/advisories/GHSA-8wmf-6v46-5gfg'
  - url: 'https://github.com/open-telemetry/opentelemetry-go'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81870.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81870'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81870'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
  - osv
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T14:57:11.645138Z'
cvssSource: cna
ingestedAt: '2026-09-16T21:05:36.875Z'
aliases:
  - GHSA-8wmf-6v46-5gfg
ecosystem: go
patched:
  - go.opentelemetry.io/otel/sdk 1.45.0
  - go.opentelemetry.io/otel/exporters/otlp/otlptrace 1.45.0
  - go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc 1.45.0
  - go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp 1.45.0
  - go.opentelemetry.io/otel/exporters/zipkin 1.45.0
scores:
  cna: 2
  vendor: 3.3
epss: 0.00195
epssPercentile: 0.08196
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-81870)

Affected packages:

- `go.opentelemetry.io/otel/sdk >= 1.5.0, <= 1.44.0`
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace >= 1.5.0, <= 1.44.0`
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc >= 1.5.0, <= 1.44.0`
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp >= 1.5.0, <= 1.44.0`
- `go.opentelemetry.io/otel/exporters/zipkin >= 1.5.0, <= 1.44.0`

Patched in:

- `go.opentelemetry.io/otel/sdk 1.45.0`
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace 1.45.0`
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc 1.45.0`
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp 1.45.0`
- `go.opentelemetry.io/otel/exporters/zipkin 1.45.0`

Source: https://github.com/advisories/GHSA-8wmf-6v46-5gfg

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81870.json)