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Fencer Vulns
low 2.0

CVE-2026-81870 json

OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs

published 2026-09-16 53 d ago modified 2026-10-01 38 d ago also EUVD-2026-81098 , GHSA-8wmf-6v46-5gfg , GO-2026-6505

cvss
2.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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.

Patch / fix

  • go go.opentelemetry.io/otel/sdk 1.45.0
  • go go.opentelemetry.io/otel/exporters/otlp/otlptrace 1.45.0
  • go go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc 1.45.0
  • go go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp 1.45.0
  • go go.opentelemetry.io/otel/exporters/zipkin 1.45.0
  • linuxfoundation opentelemetry-go 1.45.0
  • opentelemetry opentelemetry 1.45.0
  • helm Linux Micro 6.1 4.3.0-slfo.1.1_1.1
  • helm SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.3.0-160000.2.1

suse advisories SUSE-SU-2026:24282-1SUSE-SU-2026:24120-1SUSE-SU-2026:24247-1

  • helm openSUSE Leap 16.0 4.3.0-160000.2.1
  • helm openSUSE Tumbleweed 4.3.0-4.1
  • velero openSUSE Tumbleweed 1.18.4-1.1

opensuse advisories openSUSE-SU-2026:22057-1openSUSE-SU-2026:11963-1openSUSE-SU-2026:11931-1

  • azurelinux-image-tools Azure Linux 3.0 1.7.0-2
  • cert-manager Azure Linux 3.0 1.12.15-15
  • containerd2 Azure Linux 3.0 2.3.7-1
  • docker-buildx Azure Linux 3.0 0.14.0-19
  • docker-compose Azure Linux 3.0 2.27.0-16
  • etcd Azure Linux 3.0 3.5.35-1
  • flannel Azure Linux 3.0 0.24.2-34
  • kata-containers Azure Linux 3.0 4.1.0.kata1-2

azure linux advisories AZL-103116AZL-103125AZL-103134AZL-103152AZL-103158AZL-103164

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-81870 updated cvss 3.3

github.com/open-telemetry/opentelemetry-go: OpenTelemetry-Go: Information disclosure via exporter configuration logging

  • Red Hat OpenShift AI (RHOAI) rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-kserve-controller-rhel9, rhoai/odh-model-serving-api-rhel9, +5 more
    affected: no fix available “Fix deferred”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-istio-csr-rhel9 1790223719, cert-manager/cert-manager-istio-csr-rhel9 1790589914
    fixed: vendor fix RHSA-2026:72475

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
53 d ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-8wmf-6v46-5gfg referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 2.0 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
CNA 4.0 2.0 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/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

Affected packages

ecosystem package affected fixed in
go go.opentelemetry.io/otel/sdk
>=1.5.0, <1.45.0
1.45.0
go go.opentelemetry.io/otel/exporters/otlp/otlptrace
>=1.5.0, <1.45.0
1.45.0
go go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc
>=1.5.0, <1.45.0
1.45.0
go go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp
>=1.5.0, <1.45.0
1.45.0
go go.opentelemetry.io/otel/exporters/zipkin
>=1.5.0, <1.45.0
1.45.0

Affected products

  • open-telemetry opentelemetry-go

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-532 Insertion of Sensitive Information into Log File

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.