Vulnerabilities in pkg:pypi/ddtrace

PACKAGE
Advisory Identifier: GHSA-mw54-j2v2-42hr
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Advisory Summary

CVE-2026-50271 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting dd-trace-py libraries in the PyPI ecosystem. The issue involves improper parsing of w3c baggage headers may lead to dos. Remediation is available by upgrading affected packages to version 4.8.2.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/ddtrace

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/ddtrace. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-mw54-j2v2-42hr CVE-2026-50271 HIGH dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS

CVE-2026-50271 at a Glance

CVE Identifier CVE-2026-50271
GHSA Identifier GHSA-mw54-j2v2-42hr
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product dd-trace-py
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-50271

To remediate this vulnerability, upgrade all affected dd-trace-py dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

ddtrace fixed: 4.8.2 
pip install ddtrace>=4.8.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show ddtrace

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-50271, inspect your installed packages using pip:

pip show ddtrace

Analyze the terminal output to locate any version of dd-trace-py in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.8.2), your application is affected.

Note: The pip show ddtrace command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In dd-trace-py, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing item-count or byte-size limits on the extract path. The DD_TRACE_BAGGAGE_MAX_ITEMS (default 64) and DD_TRACE_BAGGAGE_MAX_BYTES (default 8192) limits were applied only to baggage injection, not extraction. 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). The tracer allocates a hash-map entry for each pair on every request, causing unbounded CPU and memory consumption and enabling a remote Denial of Service against any HTTP service that has the baggage propagation style enabled. The baggage propagation style is enabled by default in most affected tracers, so any internet-facing service that has been instrumented with an affected tracer version is exposed unless the propagation style has been explicitly narrowed. ### Patches This is resolved in version 4.8.2 and later of the `dd-trace-py` library ### Workarounds If users cannot upgrade immediately: 1. Disable `baggage` extraction by removing `baggage` from `DD_TRACE_PROPAGATION_STYLE` (or `DD_TRACE_PROPAGATION_STYLE_EXTRACT` if set independently). 2. Cap the maximum HTTP request header size at an upstream proxy or web server (for example, Apache `LimitRequestFieldSize`, Nginx `large_client_header_buffers`, Envoy `max_request_headers_kb`). ### Resources Related upstream advisories: [opentelemetry-go GHSA-mh2q-q3fh-2475](https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475) [opentelemetry-dotnet GHSA-g94r-2vxg-569j](https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j)

CVE-2026-50271 Affected dd-trace-py Versions

1 component(s)
Fixed Versions:
4.8.2
Product / Package Ecosystem Affected Versions Fixed Version
ddtrace
pypi/ddtrace
PyPI
< 4.8.2
4.8.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr
dd-trace-py Source Repository REPOSITORY
https://github.com/DataDog/dd-trace-py

Frequently Asked Questions

What is CVE-2026-50271?
CVE-2026-50271 is a security vulnerability in dd-trace-py involving Improper parsing of W3C baggage headers may lead to DoS under CWE-400: Uncontrolled Resource Consumption.
Which dd-trace-py versions are affected?
Affected versions include releases prior to 4.8.2 across affected packages: ddtrace.
What version fixes CVE-2026-50271?
Upgrading to 4.8.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ddtrace affected?
Yes, ddtrace is affected in releases prior to 4.8.2. Upgrade your dependency to 4.8.2 or later.
What is the CVSS score of CVE-2026-50271?
CVE-2026-50271 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-50271?
CVE-2026-50271 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check PyPI dependencies for CVE-2026-50271?
Run the dependency tree command: 'pip show ddtrace'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mw54-j2v2-42hr",
  "modified" : "2026-07-15T22:55:24Z",
  "published" : "2026-07-15T22:55:24Z",
  "aliases" : [ "CVE-2026-50271" ],
  "summary" : "dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS",
  "details" : "### Impact\nDatadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing item-count or byte-size limits on the extract path. The DD_TRACE_BAGGAGE_MAX_ITEMS (default 64) and DD_TRACE_BAGGAGE_MAX_BYTES (default 8192) limits were applied only to baggage injection, not extraction. 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). The tracer allocates a hash-map entry for each pair on every request, causing unbounded CPU and memory consumption and enabling a remote Denial of Service against any HTTP service that has the baggage propagation style enabled.\nThe baggage propagation style is enabled by default in most affected tracers, so any internet-facing service that has been instrumented with an affected tracer version is exposed unless the propagation style has been explicitly narrowed.\n\n### Patches\nThis is resolved in version 4.8.2 and later of the `dd-trace-py` library\n\n### Workarounds\nIf users cannot upgrade immediately:\n1. Disable `baggage` extraction by removing `baggage` from `DD_TRACE_PROPAGATION_STYLE` (or `DD_TRACE_PROPAGATION_STYLE_EXTRACT` if set independently).\n2. Cap the maximum HTTP request header size at an upstream proxy or web server (for example, Apache `LimitRequestFieldSize`, Nginx `large_client_header_buffers`, Envoy `max_request_headers_kb`).\n\n\n### Resources\nRelated upstream advisories:\n[opentelemetry-go GHSA-mh2q-q3fh-2475](https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475)\n[opentelemetry-dotnet GHSA-g94r-2vxg-569j](https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "ddtrace"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.8.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-mw54-j2v2-42hr"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/DataDog/dd-trace-py"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-15T22:55:24Z",
    "nvd_published_at" : null
  }
}