CVE-2026-40894: Opentelemetry

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTelemetry.Extensions.Propagators 1.3.1 to 1.15.2, The implementation details of the baggage, B3 and Jaeger processing code in the OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators NuGet packages can allocate excessive memory when parsing which could create a potential denial of service (DoS) in the consuming application. This vulnerability is fixed in 1.15.3.

Affected products

• Opentelemetry Opentelemetry: from 0.5.0, before 1.15.3 (fixed in 1.15.3)
• Opentelemetry Opentelemetry.api: from 0.5.0, before 1.15.3 (fixed in 1.15.3)
• Opentelemetry Opentelemetry.extensions.propagators: after 1.3.0, before 1.15.3 (fixed in 1.15.3)

Published 2026-04-23. Last modified 2026-06-17.