OpenTelemetry .NET has Denial of Service (DoS) Vulnerability in API Package

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS

• CVE-2025-27513: 0.51% estimated exploitation activity in the next 30 days; percentile 43.33 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 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 <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…

Published by the source

5 Mar 2025, 18:15 UTC

Last modified by the source

5 Mar 2025, 21:54 UTC

Source last checked

26 Oct 2026, 17:03 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-8785-wc3w-h8q6

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# Patch Next advisory brief: CVE-2025-27513

Advisory: OpenTelemetry .NET has Denial of Service (DoS) Vulnerability in API Package
IDs: CVE-2025-27513, GHSA-8785-wc3w-h8q6
Record: https://patchnext.com/advisories/cve-2025-27513 (revision 1, source checked 26 Oct 2026, 17:03 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: opentelemetry.api 1.11.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet opentelemetry.api: affected >= 1.11.0, < 1.11.2; >= 1.10.0, <= 1.10.0; >= 1.10.0-beta.1, <= 1.10.0-beta.1; >= 1.10.0-rc.1, <= 1.10.0-rc.1; >= 1.11.0-rc.1, <= 1.11.0-rc.1; fixed in 1.11.2

## Suggested inspection (read-only)
- NuGet opentelemetry.api: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on opentelemetry.api.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8785-wc3w-h8q6 (GitHub-reviewed advisory GHSA-8785-wc3w-h8q6 lists affected ranges: NuGet opentelemetry.api >=1.11.0 =1.10.0 =1.10.0-beta.1 =1.10.0-rc.1 =1.11.0-rc.1 <=1.11.0-rc.1)

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