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CVE-2026-50275— Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS

Quick assessment

Affected
DataDog dd-trace-php
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Datadog PHP Tracer 为 PHP 应用提供应用性能监控和分布式追踪功能。在 1.19.2 版本之前，位于 中的 函数在解析传入的 W3C baggage HTTP 头时，未强制执行 或 限制。远程未认证客户端可以发送任意数量的逗号分隔键值对，或单个超大值，导致追踪器在每次请求中分配哈希表条目，从而消耗无上限的 CPU 和内存。在大多数受影响的环境中，除非从 或 中移除了 baggage，否则 baggage 提取功能默认处于启用状态。该问题已在 1.19.2 版本中修复。

CVSS 7.5 · High EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
DataDog dd-trace-php < 1.19.2 affected
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I. Basic Information for CVE-2026-50275

Vulnerability Information
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Vulnerability Title
Datadog PHP Tracer: Improper parsing of W3C baggage headers may lead to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
The Datadog PHP Tracer provides application performance monitoring and distributed tracing for PHP. Prior to 1.19.2, ddtrace_deserialize_baggage in ext/distributed_tracing_headers.c parses incoming W3C baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES. A remote unauthenticated client can send an arbitrarily large number of comma-separated key-value pairs or a single oversized value, causing the tracer to allocate hash-map entries and consume unbounded CPU and memory on each request. Baggage extraction is enabled by default in most affected deployments unless baggage is removed from DD_TRACE_PROPAGATION_STYLE or DD_TRACE_PROPAGATION_STYLE_EXTRACT. This issue is fixed in version 1.19.2.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
DataDog dd-trace-php < 1.19.2 -

II. Public POCs for CVE-2026-50275

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III. Intelligence Information for CVE-2026-50275

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Patches & Fixes for CVE-2026-50275 (3)

Vendor Advisories for CVE-2026-50275 (1)

Vendor Pages for CVE-2026-50275 (2)

IV. Related Vulnerabilities

Same vendor: DataDog
Same weakness: CWE-770

V. Comments for CVE-2026-50275

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