Vulnerability in Open-Telemetry Opentelemetry-Dotnet-Contrib
CVE-2026-44213
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.
Vulnerability class: Improper Certificate Validation
EPSS: 0.002 (10.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Open-telemetry Opentelemetry-dotnet-contrib — versions < 1.1.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-44213?
- CVE-2026-44213 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Dotnet-Contrib, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2026-05-26.
- How severe is CVE-2026-44213?
- Medium severity. CVSS v3 base score is 6.5 out of 10.