golang-opentelemetry-otel — security advisory

{
  "id": "2317a699567b419069b87a874005ab8f861066720f02ef53cb7ff399c7dc299c",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-81871",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-81871",
    "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 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.",
    "evidence": "osv:UBUNTU-CVE-2026-81871",
    "products": [
      {
        "name": {
          "value": "golang-opentelemetry-otel",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.1.0-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "golang-opentelemetry-otel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.16.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "golang-opentelemetry-otel",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.31.0-6",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.43.0-4build1",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "golang-opentelemetry-otel",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.31.0-4",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1.31.0-5",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1.31.0-6",
            "evidence": "/affected/3/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-81871",
      "aliases": [
        "UBUNTU-CVE-2026-81871"
      ],
      "metrics": [
        {
          "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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "golang-opentelemetry-otel",
            "purl": "pkg:deb/ubuntu/golang-opentelemetry-otel?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "1.1.0-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81871.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "golang-opentelemetry-otel-dev",
                "binary_version": "1.1.0-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "golang-opentelemetry-otel",
            "purl": "pkg:deb/ubuntu/golang-opentelemetry-otel?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "1.16.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81871.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "golang-opentelemetry-otel-dev",
                "binary_version": "1.16.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "golang-opentelemetry-otel",
            "purl": "pkg:deb/ubuntu/golang-opentelemetry-otel?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "1.31.0-6",
            "1.43.0-4build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81871.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "golang-opentelemetry-otel-dev",
                "binary_version": "1.43.0-4build1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "golang-opentelemetry-otel",
            "purl": "pkg:deb/ubuntu/golang-opentelemetry-otel?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "1.31.0-4",
            "1.31.0-5",
            "1.31.0-6"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81871.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "golang-opentelemetry-otel-dev",
                "binary_version": "1.31.0-6"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:10.702061389Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-81871"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-81871",
        "https://www.cve.org/CVERecord?id=CVE-2026-81871",
        "https://github.com/open-telemetry/opentelemetry-go/commit/c65d435b43e5e6b82310e6b18dd4cdcb8ac63a0c",
        "https://github.com/open-telemetry/opentelemetry-go/releases/tag/exporters/otlp/otlplog/otlploggrpc/v0.21.0",
        "https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w34q-cm8f-9c5x"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-81871",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361145,
  "published_at": "2026-09-16T21:17:00+00:00"
}