High 7.5Published Jul 17, 2026

CVE-2026-50273Datadog .NET Tracer: Improper parsing of W3C baggage headers may lead to DoS

Updated under an hour ago (Oct 27, 2026, 5:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Datadog .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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

DataDog dd-trace-dotnet datadog:dd_trace_dotnet (from the name)	before 3.43.0	CNA record

References

References

https://github.com/DataDog/dd-trace-dotnet/security/advisories/GHSA-38wr-vpc7-2mp4	x-refsource-confirm
https://github.com/DataDog/dd-trace-dotnet/pull/8555	x-refsource-misc
https://github.com/DataDog/dd-trace-dotnet/commit/38092e0d41a36decbe649e048e48ae1b1607292f	x-refsource-misc
https://github.com/DataDog/dd-trace-dotnet/releases/tag/v3.43.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.