open-telemetry opentelemetry-dotnet up to 1.11.1 OpenTelemetry.Api allocation of resources

Summaryinfo

A vulnerability marked as critical has been reported in open-telemetry opentelemetry-dotnet up to 1.11.1. Affected is an unknown function of the component OpenTelemetry.Api. The manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2025-27513. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in open-telemetry opentelemetry-dotnet up to 1.11.1 and classified as critical. This issue affects an unknown code of the component OpenTelemetry.Api. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-27513 since 02/26/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.11.2 eliminates this vulnerability. Applying the patch 1b555c1201413f2f55f2cd3c4ba03ef4b615b6b5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• open-telemetry

Name

• opentelemetry-dotnet

Version

• 1.11.0
• 1.11.1

License

• open-source

Website

• Product: https://github.com/open-telemetry/opentelemetry-dotnet/

CPE 2.3info

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CPE 2.2info

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