open-telemetry opentelemetry-dotnet-contrib up to 1.0.x Instana API INSTANA_ENDPOINT_PROXY certificate validation

Summaryinfo

A vulnerability was found in open-telemetry opentelemetry-dotnet-contrib up to 1.0.x and classified as problematic. The affected element is an unknown function of the component Instana API. Executing a manipulation of the argument INSTANA_ENDPOINT_PROXY can lead to certificate validation. This vulnerability is handled as CVE-2026-44213. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in open-telemetry opentelemetry-dotnet-contrib up to 1.0.x. It has been declared as problematic. This vulnerability affects an unknown code of the component Instana API. The manipulation of the argument INSTANA_ENDPOINT_PROXY with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. CVE summarizes:

The OpenTelemetry.Exporter.Instana exports telemetry to Instana backend. Prior to 1.1.0, the OpenTelemetry.Exporter.Instana NuGet package does not validate HTTPS/TLS certificates are valid when sending telemetry to a configured Instana back-end when a proxy is configured using the INSTANA_ENDPOINT_PROXY environment variable. If a network attacker can Man-in-the-Middle (MitM) the proxy connection, all OpenTelemetry telemetry data and the Instana API key are exposed to the attacker. This vulnerability is fixed in 1.1.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-44213 since 05/05/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1587.003 by the MITRE ATT&CK project.

Upgrading to version 1.1.0 eliminates this vulnerability.

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Productinfo

Vendor

• open-telemetry

Name

• opentelemetry-dotnet-contrib

Version

• 1.0

Website

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

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