{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "OpenTelemetry.Api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.11.0"
            },
            {
              "fixed": "1.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "OpenTelemetry.Api"
      },
      "versions": [
        "1.10.0"
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "OpenTelemetry.Api"
      },
      "versions": [
        "1.10.0-beta.1"
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "OpenTelemetry.Api"
      },
      "versions": [
        "1.10.0-rc.1"
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "OpenTelemetry.Api"
      },
      "versions": [
        "1.11.0-rc.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-27513"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-05T18:15:22Z",
    "nvd_published_at": "2025-03-05T19:15:39Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nA vulnerability in `OpenTelemetry.Api` package `1.10.0` to `1.11.1` could cause a Denial of Service (DoS) when a `tracestate` and `traceparent` header is received.\n\n* Even if an application does not explicitly use trace context propagation, receiving these headers can still trigger high CPU usage.\n* This issue impacts any application accessible over the web or backend services that process HTTP requests containing a `tracestate` header.\n* Application may experience excessive resource consumption, leading to increased latency, degraded performance, or downtime.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nThis issue has been \u003cstrong data-start=\"1143\" data-end=\"1184\"\u003eresolved in OpenTelemetry.Api 1.11.2\u003c/strong\u003e by \u003cstrong data-start=\"1188\" data-end=\"1212\"\u003ereverting the change\u003c/strong\u003e that introduced the problematic behavior in versions \u003cstrong data-start=\"1266\" data-end=\"1286\"\u003e1.10.0 to 1.11.1\u003c/strong\u003e.\u003c/li\u003e\u003cli data-start=\"1290\" data-end=\"1409\"\u003eThe fix ensures that \u003cstrong data-start=\"1313\" data-end=\"1380\"\u003evalid tracing headers no longer cause excessive CPU consumption\u003c/strong\u003e when received in requests.\u003c/li\u003e\u003c/ul\u003e\u003ch4 data-start=\"1411\" data-end=\"1434\"\u003e\u003cstrong data-start=\"1416\" data-end=\"1434\"\u003eFixed Version:\u003c/strong\u003e\u003c/h4\u003e\nOpenTelemetry .NET Version | Status\n-- | --\n\u003c= 1.9.x | \u2705 Not affected\n1.10.0 - 1.11.1 | \u274c Vulnerable\n1.11.2 (Fixed) | \u2705 Safe to use\n\n**Upgrade Command:**\n\n```\ndotnet add package OpenTelemetry --version 1.11.2\n```\n\n**Delisting of Affected Packages**\nTo prevent accidental usage, we have delisted the affected versions (1.10.0 to 1.11.1) from NuGet. Users should avoid these versions and upgrade to 1.11.2 immediately.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\n### References\n_Are there any links users can visit to find out more?_",
  "id": "GHSA-8785-wc3w-h8q6",
  "modified": "2025-03-05T21:54:14Z",
  "published": "2025-03-05T18:15:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-8785-wc3w-h8q6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27513"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet/pull/6161"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet/commit/1b555c1201413f2f55f2cd3c4ba03ef4b615b6b5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/open-telemetry/opentelemetry-dotnet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenTelemetry .NET has Denial of Service (DoS) Vulnerability in API Package"
}