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CVE-2026-50277— dd-trace-cpp: Improper parsing of W3C baggage headers may lead to DoS

Quick assessment

Affected
DataDog dd-trace-cpp
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.

dd-trace-cpp 是 Datadog 的 C++ 分布式追踪库。在 2.1.0 之前，dd-trace-cpp 在解析传入的 W3C baggage 头部时，未在提取路径上执行 或 的限制，而这些限制在注入阶段是有效的。一个远程未认证的攻擊者可以发送包含大量逗号分隔的键值对或一个非常大的值的头部，从而导致每个请求产生哈希表分配，造成无界的 CPU 和内存消耗。在大多数受影响的追踪器中，除非从 或 中移除 baggage，否则 baggage 提取功能默认启用，因此面向互联网的受影响服务可能会遭受服务拒绝（D

CVSS 7.5 · High EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1218 · System Binary Proxy Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
DataDog dd-trace-cpp < 2.1.0 affected
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I. Basic Information for CVE-2026-50277

Vulnerability Information
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Vulnerability Title
dd-trace-cpp: Improper parsing of W3C baggage headers may lead to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
dd-trace-cpp is the Datadog distributed tracing library for C++. Prior to 2.1.0, dd-trace-cpp parses incoming W3C baggage headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES on the extraction path, even though those limits are enforced during injection. A remote unauthenticated attacker can send a header containing many comma-separated key-value pairs or one very large value, causing per-request hash-map allocation and unbounded CPU and memory consumption. Baggage extraction is enabled by default in most affected tracers unless baggage is removed from DD_TRACE_PROPAGATION_STYLE or DD_TRACE_PROPAGATION_STYLE_EXTRACT, so affected internet-facing services can be denied service. This issue is fixed in version 2.1.0.
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-cpp < 2.1.0 -

II. Public POCs for CVE-2026-50277

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III. Intelligence Information for CVE-2026-50277

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Patches & Fixes for CVE-2026-50277 (2)

Vendor Advisories for CVE-2026-50277 (1)

Vendor Pages for CVE-2026-50277 (1)

IV. Related Vulnerabilities

Same product: dd-trace-cpp
Same vendor: DataDog
Same weakness: CWE-770

V. Comments for CVE-2026-50277

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