---
id: CVE-2026-50277
title: dd-trace-cpp is the Datadog distributed tracing library for C++
summary: >-
  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 tho…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: DataDog
product: dd-trace-cpp
affected:
  - dd-trace-cpp < 2.1.0
published: '2026-09-17'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T21:17:04.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50277'
references:
  - url: >-
      https://github.com/DataDog/dd-trace-cpp/commit/422dc91bb93e358e3977381275d311f3f926d666
    label: security-advisories@github.com
  - url: 'https://github.com/DataDog/dd-trace-cpp/pull/313'
    label: security-advisories@github.com
  - url: 'https://github.com/DataDog/dd-trace-cpp/releases/tag/v2.1.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/DataDog/dd-trace-cpp/security/advisories/GHSA-ch7h-phmx-rqwq
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T21:12:22.481903Z'
epss: 0.00562
epssPercentile: 0.45264
ingestedAt: '2026-09-17T20:28:02.782Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.