{"id":"CVE-2026-81871","title":"OpenTelemetry-Go is the Go implementation of OpenTelemetry","summary":"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…","severity":"medium","cvss":6.3,"cvssVector":"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","cwe":["CWE-295","CWE-923"],"vendor":"open-telemetry","product":"opentelemetry-go","affected":["opentelemetry-go < 0.21.0"],"published":"2026-09-16","updated":"2026-09-17","sourceUpdated":"2026-09-17T20:18:40.623","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81871","references":[{"url":"https://github.com/open-telemetry/opentelemetry-go/commit/c65d435b43e5e6b82310e6b18dd4cdcb8ac63a0c","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/releases/tag/exporters/otlp/otlplog/otlploggrpc/v0.21.0","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w34q-cm8f-9c5x","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81871"},{"url":"https://github.com/open-telemetry/opentelemetry-go"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81871.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-81871"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535725"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81871"},{"url":"https://access.redhat.com/errata/RHSA-2026:68715"},{"url":"https://access.redhat.com/errata/RHSA-2026:68716"},{"url":"https://access.redhat.com/errata/RHSA-2026:68777"},{"url":"https://access.redhat.com/errata/RHSA-2026:68821"},{"url":"https://access.redhat.com/errata/RHSA-2026:68926"},{"url":"https://access.redhat.com/errata/RHSA-2026:68778"},{"url":"https://access.redhat.com/errata/RHSA-2026:68717"},{"url":"https://access.redhat.com/errata/RHSA-2026:68729"},{"url":"https://access.redhat.com/errata/RHSA-2026:68910"},{"url":"https://access.redhat.com/errata/RHSA-2026:68932"},{"url":"https://access.redhat.com/errata/RHSA-2026:68941"},{"url":"https://access.redhat.com/errata/RHSA-2026:68905"},{"url":"https://access.redhat.com/errata/RHSA-2026:68903"},{"url":"https://access.redhat.com/errata/RHSA-2026:68912"}],"tags":["nvd","cve.org","osv","go","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T17:10:34.419383Z"},"cvssSource":"cna","ingestedAt":"2026-09-16T21:05:36.879Z","aliases":["GHSA-w34q-cm8f-9c5x"],"ecosystem":"go","patched":["go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc 0.21.0"],"scores":{"cna":6.3,"vendor":6.5},"epss":0.00196,"epssPercentile":0.09636,"slug":"CVE-2026-81871","body":"## Overview\n\nOpenTelemetry-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-81871)\n\nAffected packages:\n\n- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc < 0.21.0`\n\nPatched in:\n\n- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc 0.21.0`\n\nSource: https://osv.dev/vulnerability/GHSA-w34q-cm8f-9c5x\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Assisted Installer for Red Hat OpenShift Container Platform 2, Logging Subsystem for Red Hat OpenShift, Multiarch Tuning Operator, Multicluster Engine for Kubernetes, Multicluster Global Hub, OpenShift Developer Tools and Services, … · no fix planned: Assisted Installer for Red Hat OpenShift Container Platform 2, Logging Subsystem for Red Hat OpenShift, OpenShift Developer Tools and Services, Red Hat Advanced Cluster Management for Kubernetes 2, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81871.json)\n- **RHSA-2026:68715** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68715)\n- **RHSA-2026:68716** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68716)\n- **RHSA-2026:68777** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68777)\n- **RHSA-2026:68821** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68821)\n- **RHSA-2026:68926** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68926)\n- **RHSA-2026:68778** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68778)\n- **RHSA-2026:68717** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68717)\n- **RHSA-2026:68729** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68729)\n- **RHSA-2026:68910** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68910)\n- **RHSA-2026:68932** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68932)\n- **RHSA-2026:68941** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68941)","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":34.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}