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CVE-2026-50271— dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS

Quick assessment

Affected
DataDog dd-trace-py
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Datadog dd-trace-py是Datadog公司的一款Python应用程序的分布式追踪库。 Datadog dd-trace-py 4.8.2之前版本存在资源管理错误漏洞，该漏洞源于解析传入的baggage HTTP标头时未强制执行DD_TRACE_BAGGAGE_MAX_ITEMS或DD_TRACE_BAGGAGE_MAX_BYTES限制，可能导致远程未经验证的攻击者发送包含大量逗号分隔键值对或单个超大值的请求，造成CPU和内存无限制消耗，导致启用baggage传播的HTTP服务拒绝服务。

CVSS 7.5 · High EPSS 0.79% · P55

Affected Version Matrix 1

VendorProduct Version RangeStatus
DataDog dd-trace-py < 4.8.2 affected
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I. Basic Information for CVE-2026-50271

Vulnerability Information
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Vulnerability Title
dd-trace-py: Improper parsing of W3C baggage headers may lead to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Datadog dd-trace-py 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Datadog dd-trace-py是Datadog公司的一款Python应用程序的分布式追踪库。 Datadog dd-trace-py 4.8.2之前版本存在资源管理错误漏洞，该漏洞源于解析传入的baggage HTTP标头时未强制执行DD_TRACE_BAGGAGE_MAX_ITEMS或DD_TRACE_BAGGAGE_MAX_BYTES限制，可能导致远程未经验证的攻击者发送包含大量逗号分隔键值对或单个超大值的请求，造成CPU和内存无限制消耗，导致启用baggage传播的HTTP服务拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
DataDog dd-trace-py < 4.8.2 -

II. Public POCs for CVE-2026-50271

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7387 chars
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III. Intelligence Information for CVE-2026-50271

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Patches & Fixes for CVE-2026-50271 (2)

Vendor Advisories for CVE-2026-50271 (1)

Vendor Pages for CVE-2026-50271 (1)

Same Patch Batch · DataDog · 2026-07-17 · 4 CVEs total

CVE-2026-50273 7.5 HIGH Datadog .NET Tracer: Improper parsing of W3C baggage headers may lead to DoS
CVE-2026-50272 7.5 HIGH dd-trace: Improper parsing of W3C baggage headers may lead to DoS
CVE-2026-50274 7.5 HIGH dd-trace-go: Improper parsing of W3C baggage headers may lead to DoS

IV. Related Vulnerabilities

Same vendor: DataDog
Same weakness: CWE-770

V. Comments for CVE-2026-50271

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