Datadog .NET Tracer: Improper parsing of W3C baggage headers may lead to DoS
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| DataDog | dd-trace-dotnet | before 3.43.0 | 3.43.0 | Patch available | CNA |
| — | Datadog.Trace (NuGet) | before 3.43.0 | 3.43.0 | Patch available | GHSA-38wr-vpc7-2mp4 |
| — | Datadog.Trace.OpenTracing (NuGet) | before 3.43.0 | 3.43.0 | Patch available | GHSA-38wr-vpc7-2mp4 |
- dd-trace-dotnet VendorDataDog Affected before 3.43.0 Fixed in 3.43.0 Patch available CNA
- Datadog.Trace (NuGet) Vendor— Affected before 3.43.0 Fixed in 3.43.0 Patch available GHSA-38wr-vpc7-2mp4
- Datadog.Trace.OpenTracing (NuGet) Vendor— Affected before 3.43.0 Fixed in 3.43.0 Patch available GHSA-38wr-vpc7-2mp4
Remediation
- Fix · CNA dd-trace-dotnet (DataDog) Fixed in 3.43.0
- Fix · GHSA-38wr-vpc7-2mp4 Datadog.Trace (NuGet) Fixed in 3.43.0 Advisory →
- Fix · GHSA-38wr-vpc7-2mp4 Datadog.Trace.OpenTracing (NuGet) Fixed in 3.43.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-50273
- 2026-10-03 Alias added: GHSA-38wr-vpc7-2mp4
References
Other 5
- https://github.com/DataDog/dd-trace-dotnet/security/advisories/GHSA-38wr-vpc7-2mp4
- https://github.com/DataDog/dd-trace-dotnet/pull/8555
- https://github.com/DataDog/dd-trace-dotnet/commit/38092e0d41a36decbe649e048e48ae1b1607292f
- https://github.com/DataDog/dd-trace-dotnet/releases/tag/v3.43.0
- https://github.com/DataDog/dd-trace-dotnet
More DataDog vulnerabilities
- TI-2026-32833 GuardDog: Blind GitHub URL rewrite in remote project scanning causes SSRF and `GH_TOKEN` exfiltration CVSS 3.1HIGH 8.2
- TI-2022-07587 GuardDog vulnerable to arbitrary file write when scanning a specially-crafted remote PyPI package CVSS 3.1MEDIUM 6.5
- TI-2026-26107 dd-trace-java: Unsafe deserialization in RMI instrumentation may lead to remote code execution CVSS 4.0CRITICAL 9.3
- TI-2026-81528 ReDoS in dd-trace URL query string obfuscation CVSS 4.0HIGH 8.7
- TI-2026-80927 ReDoS in Datadog dd-trace-py URL query string obfuscation CVSS 4.0HIGH 8.7
- TI-2023-20052 import-in-the-middle allows unsanitized user controlled input in module generation CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-50273 · CVE Program
- CVE-2026-50273 · NVD
- FIRST EPSS
- GHSA-38wr-vpc7-2mp4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences