High severity · published Jul 17, 2026
CVE-2026-50273
Datadog .NET Tracer: Improper parsing of W3C baggage headers may lead to DoS
7.5
CVSS
0.8%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DD
dd-trace-dotnet · DataDog
< 3.43.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50273
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50273
github.com
https://github.com/DataDog/dd-trace-dotnet/commit/38092e0d41a36decbe649e048e48ae1b1607292f
github.com
https://github.com/DataDog/dd-trace-dotnet/pull/8555
github.com
https://github.com/DataDog/dd-trace-dotnet/releases/tag/v3.43.0
github.com
https://github.com/DataDog/dd-trace-dotnet/security/advisories/GHSA-38wr-vpc7-2mp4