CVE-2026-44213 MEDIUM

CVE-2026-44213: OpenTelemetry.Exporter.Instana bypasses TLS certificate validation when a proxy is configured

Vendor Open-Telemetry
Product opentelemetry-dotnet-contrib
Weakness CWE-295
Published May 26, 2026
Last update May 27, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 26, 2026 CVE published
May 27, 2026 Record updated