{"id":"DEBIAN-CVE-2026-81871","details":"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.","modified":"2026-09-20T11:00:11.073586415Z","published":"2026-09-16T21:17:22.323Z","upstream":["CVE-2026-81871"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-81871"}],"affected":[{"package":{"name":"golang-opentelemetry-otel","ecosystem":"Debian:12","purl":"pkg:deb/debian/golang-opentelemetry-otel?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0-2","1.10.0-1","1.16.0-1","1.16.0-2","1.19.0-0","1.21.0-1","1.21.0-2","1.21.0-3","1.21.0-4","1.31.0-1","1.31.0-2","1.31.0-3","1.31.0-4","1.31.0-5","1.31.0-6","1.43.0-1","1.43.0-2","1.43.0-3","1.43.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81871.json"}},{"package":{"name":"golang-opentelemetry-otel","ecosystem":"Debian:13","purl":"pkg:deb/debian/golang-opentelemetry-otel?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.31.0-4","1.31.0-5","1.31.0-6","1.43.0-1","1.43.0-2","1.43.0-3","1.43.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81871.json"}},{"package":{"name":"golang-opentelemetry-otel","ecosystem":"Debian:14","purl":"pkg:deb/debian/golang-opentelemetry-otel?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.31.0-4","1.31.0-5","1.31.0-6","1.43.0-1","1.43.0-2","1.43.0-3","1.43.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81871.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}