dd-trace-cpp: Improper parsing of W3C baggage headers may lead to DoS

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-50277
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 21:17:14 UTC
Updated2026-09-21 21:17:04 UTC
Descriptiondd-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.005620000 probability, percentile 0.455160000 (date 2026-09-22)

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA DataDog Dd-trace-cpp affected < 2.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/DataDog/dd-trace-cpp/commit/422dc91bb93e358e3977381275d311f3f... [email protected] github.com
github.com/DataDog/dd-trace-cpp/releases/tag/v2.1.0 [email protected] github.com
github.com/DataDog/dd-trace-cpp/security/advisories/GHSA-ch7h-phmx-rqwq [email protected] github.com
github.com/DataDog/dd-trace-cpp/pull/313 [email protected] github.com
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