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dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS

Type: advisorySources: OSV

Datadog dd-trace-py is the Datadog Python APM client. Prior to 4.8.2, Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES limits on the extract path. A remote, unauthenticated attacker can send a request whose baggage header contains an arbitrarily large number of comma-separated key-value pairs or a single very large value, causing unbounded CPU and memory consumption and enabling a remote denial of service against HTTP services with baggage propagation enabled. This issue is fixed in version 4.8.2.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-50271
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:43 UTC · Revision 1

Source evidence

dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS

core-osv · Original source

Published 17 Jul 2026, 20:42 UTC

Datadog dd-trace-py is the Datadog Python APM client. Prior to 4.8.2, Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES limits on the extract path. A remote, unauthenticated attacker can send a request whose baggage header contains an arbitrarily large number of comma-separated key-value pairs or a single very large value, causing unbounded CPU and memory consumption and enabling a remote denial of service against HTTP services with baggage propagation enabled. This issue is fixed in version 4.8.2.

osv:CVE-2026-50271
Complete source record
{
  "id": "a397dd06dd45b8f090bb2f746d020009780bcf5e8b8c3a452f587c9d7e3c088c",
  "url": "https://osv.dev/vulnerability/CVE-2026-50271",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS",
    "summary": "Datadog dd-trace-py is the Datadog Python APM client. Prior to 4.8.2, Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES limits on the extract path. A remote, unauthenticated attacker can send a request whose baggage header contains an arbitrarily large number of comma-separated key-value pairs or a single very large value, causing unbounded CPU and memory consumption and enabling a remote denial of service against HTTP services with baggage propagation enabled. This issue is fixed in version 4.8.2.",
    "evidence": "osv:CVE-2026-50271",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-50271",
      "aliases": [
        "CVE-2026-50271",
        "GHSA-mw54-j2v2-42hr",
        "PYSEC-2026-3461"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/datadog/dd-trace-py",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "58d0fd22d5d203637283843f8450bcdf64959fec"
                },
                {
                  "fixed": "9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd"
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              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.8.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd"
                      }
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                    "source": "REFERENCES_COMMIT"
                  },
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                    "range": [
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                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.8.2"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50271.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.203974430Z",
      "provider": "osv",
      "references": [
        "https://github.com/DataDog/dd-trace-py/releases/tag/v4.8.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50271.json",
        "https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50271",
        "https://github.com/DataDog/dd-trace-py/commit/9c80faa3dcfe238d008c3b3cd0b8e5dfef0aa4cd",
        "https://github.com/DataDog/dd-trace-py/pull/17926"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50271.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-50271",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514381,
  "published_at": "2026-07-17T20:42:34.036+00:00"
}