{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:.net:*:*",
            "extracted_events": [
              {
                "introduced": "1.13.1"
              },
              {
                "fixed": "1.15.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE"
            ]
          },
          "events": [
            {
              "introduced": "640cf63628567b76b348b26988920dbc0b5c1662"
            },
            {
              "fixed": "d622e6c7c899527638b53a6b06919859f5752add"
            }
          ],
          "repo": "https://github.com/open-telemetry/opentelemetry-dotnet",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mr8r-92fq-pj8p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40891.json"
  },
  "details": "OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS). This vulnerability is fixed in 1.15.2.",
  "id": "CVE-2026-40891",
  "modified": "2026-07-08T05:39:08.398526686Z",
  "published": "2026-04-23T17:54:36.033Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40891.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40891"
    },
    {
      "type": "FIX",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980"
    },
    {
      "type": "FIX",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling"
}