Vulnerability · Published Sep 16, 2026 · Assigned by GitHub_M
CVE-2026-81870OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs
Low 2.0
In plain English
A low-severity information exposure in opentelemetry-go from open-telemetry. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | golang-opentelemetry-otel | no fix listed | DEBIAN-CVE-2026-81870 |
| Debian:14 | golang-opentelemetry-otel | no fix listed | DEBIAN-CVE-2026-81870 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace | 1.45.0 | GO-2026-6505 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace | 1.45.0 | GHSA-8wmf-6v46-5gfg |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc | 1.45.0 | GO-2026-6505 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc | 1.45.0 | GHSA-8wmf-6v46-5gfg |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp | 1.45.0 | GHSA-8wmf-6v46-5gfg |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp | 1.45.0 | GO-2026-6505 |
| Go | go.opentelemetry.io/otel/exporters/zipkin | 1.45.0 | GHSA-8wmf-6v46-5gfg |
| Go | go.opentelemetry.io/otel/exporters/zipkin | 1.45.0 | GO-2026-6505 |
| Go | go.opentelemetry.io/otel/sdk | 1.45.0 | GHSA-8wmf-6v46-5gfg |
| Go | go.opentelemetry.io/otel/sdk | 1.45.0 | GO-2026-6505 |
| Ubuntu:22.04:LTS | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-81870 |
| Ubuntu:24.04:LTS | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-81870 |
| Ubuntu:26.04:LTS | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-81870 |
| Ubuntu:26.10 | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-81870 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-telemetry | opentelemetry-go | >= 1.5.0, < 1.45.0 |
Weakness: CWE-200, CWE-532 · Vector: 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
References
- https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-8wmf-6v46-5gfg x_refsource_CONFIRM
- https://github.com/open-telemetry/opentelemetry-go/pull/8438 x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-go/commit/3a1412d2b3bc4e4231fbeac2ed42117ae541bb38 x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-go/releases/tag/exporters/zipkin/v1.45.0 x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.45.0 x_refsource_MISC