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Advisory record · GHSA-w34q-cm8f-9c5x

OpenTelemetry-Go: Log gRPC exporter ignores env TLS certs, bypassing mTLS/pinning

CVSS 6.3 MediumEPSS 0.0020 · 9th percentile

Published by the GitHub Advisory Database at 17 Sept 2026, 20:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpcGo<0.21.00.21.0
Identifiers
GHSA-w34q-cm8f-9c5x · CVE-2026-81871 · GO-2026-6508
Weakness (CWE)
CWE-295 · CWE-923
Tags
Published
17 Sept 2026
Updated
28 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The OTLP log gRPC exporter in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc, versions before 0.21.0, loads TLS certificate settings from environment variables but does not apply them to the connection, so CA pinning and client certificates configured that way are ignored. An attacker who can intercept or spoof the collector connection using a certificate trusted by the system can read or alter log data. Upgrade to 0.21.0 or later; without upgrading, pass the TLS settings explicitly with WithTLSCredentials.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 9th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.