Datadog .NET Tracer: Improper parsing of W3C baggage headers may lead to DoS

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Summary

CVECVE-2026-50273
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-17 18:17:16 UTC
Updated2026-07-17 20:17:24 UTC
DescriptionDatadog .NET Tracer is a client library for Datadog APM for .NET applications. Prior to 3.43.0, 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 on extraction, allowing a remote unauthenticated attacker to send a baggage header with many comma-separated key-value pairs or one very large value and cause unbounded CPU and memory consumption in services with baggage propagation enabled. This issue is fixed in version 3.43.0.

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

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-dotnet affected < 3.43.0 Not specified

References

ReferenceSourceLinkTags
github.com/DataDog/dd-trace-dotnet/commit/38092e0d41a36decbe649e048e48ae... [email protected] github.com
github.com/DataDog/dd-trace-dotnet/pull/8555 [email protected] github.com
github.com/DataDog/dd-trace-dotnet/releases/tag/v3.43.0 [email protected] github.com
github.com/DataDog/dd-trace-dotnet/security/advisories/GHSA-38wr-vpc7-2mp4 [email protected] github.com
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