DoS Vulnerability in TraceContextPropagator.Extract - OpenTelemetry.Api
Impact
What kind of vulnerability is it? Who is impacted?
A vulnerability in OpenTelemetry.Api package 1.10.0 to 1.11.1 could cause a Denial of Service (DoS) when a tracestate and traceparent header is received. These versions are used in OpenTelemetry .NET Automatic Instrumentation 1.10.0-beta.1 and 1.10.0.
Even if an application does not explicitly use trace context propagation, receiving these headers can still trigger high CPU usage. This issue impacts any application accessible over the web or backend services that process HTTP requests containing a tracestate header. Application may experience excessive resource consumption, leading to increased latency, degraded performance, or downtime.
Patches
Has the problem been patched? What versions should users upgrade to?
This issue has been resolved in OpenTelemetry.Api 1.11.2 by reverting the change that introduced the problematic behavior in versions 1.10.0 to 1.11.1. OpenTelemetry .NET Automatic Instrumentation fixes it in 1.11.0 release.
Fixed version
| OpenTelemetry .NET Automatic Instrumentation | Status |
|---|---|
| <= 1.9.0 | ✅ Not affected |
| 1.10.0-beta.1, 1.10.0 | ❌ Vulnerable |
| 1.11.0 (Fixed) | ✅ Safe to use |
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
References
Are there any links users can visit to find out more?
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | OpenTelemetry.AutoInstrumentation | >= 1.10.0-beta.1, < 1.11.0 | 1.11.0 |
References
- https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/security/advisories/GHSA-vc29-vg52-6643
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-8785-wc3w-h8q6
- https://nvd.nist.gov/vuln/detail/CVE-2025-27513
- https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- .NET (NuGet)
- Package
OpenTelemetry.AutoInstrumentation- Disclosed
- 06.03.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-vc29-vg52-6643 - CC BY 4.0
Vulnerability history: OpenTelemetry.AutoInstrumentation
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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