OpenTelemetry .NET has Denial of Service (DoS) Vulnerability in API Package
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.
- 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
tracestateheader. - 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 <strong data-start="1143" data-end="1184">resolved in OpenTelemetry.Api 1.11.2</strong> by <strong data-start="1188" data-end="1212">reverting the change</strong> that introduced the problematic behavior in versions <strong data-start="1266" data-end="1286">1.10.0 to 1.11.1</strong>.</li><li data-start="1290" data-end="1409">The fix ensures that <strong data-start="1313" data-end="1380">valid tracing headers no longer cause excessive CPU consumption</strong> when received in requests.</li></ul><h4 data-start="1411" data-end="1434"><strong data-start="1416" data-end="1434">Fixed Version:</strong></h4>
| OpenTelemetry .NET Version | Status |
|---|---|
| <= 1.9.x | ✅ Not affected |
| 1.10.0 - 1.11.1 | ❌ Vulnerable |
| 1.11.2 (Fixed) | ✅ Safe to use |
Upgrade Command:
dotnet add package OpenTelemetry --version 1.11.2Delisting of Affected Packages To prevent accidental usage, we have delisted the affected versions (1.10.0 to 1.11.1) from NuGet. Users should avoid these versions and upgrade to 1.11.2 immediately.
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.Api | >= 1.11.0, < 1.11.2, = 1.10.0, = 1.10.0-beta.1, = 1.10.0-rc.1, = 1.11.0-rc.1 | 1.11.2 |
References
- 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/pull/6161
- https://github.com/open-telemetry/opentelemetry-dotnet/commit/1b555c1201413f2f55f2cd3c4ba03ef4b615b6b5
- https://github.com/open-telemetry/opentelemetry-dotnet
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- .NET (NuGet)
- Package
OpenTelemetry.Api- Disclosed
- 05.03.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8785-wc3w-h8q6 - CC BY 4.0
Vulnerability history: OpenTelemetry.Api
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 03.2025 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2025: 1
- 2026: 1
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OpenTelemetry .NET has Denial of Service (DoS) Vulnerability in API Package this entry
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