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Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.21.0, the exporters/otlp/otlplog/otlploggrpc package loads OTEL_EXPORTER_OTLP_LOGS_CERTIFICATE, OTEL_EXPORTER_OTLP_CERTIFICATE, and related client certificate environment variables through loadEnvTLS into cfg.tlsCfg, but newGRPCDialOptions does not apply cfg.tlsCfg when creating gRPC transport credentials. The environment-only TLS path instead uses credentials.NewTLS with system roots and no configured client certificate, bypassing intended private CA pinning and mutual TLS unless the application also supplies WithTLSCredentials. A network attacker able to intercept or spoof the collector connection with a system-trusted certificate can read or alter log telemetry. This issue is fixed in version 0.21.0.
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Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "open-telemetry",
"product": "opentelemetry-go",
"versions": [
{
"version": "< 0.21.0",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON