CVE-2026-40182: Opentelemetry

Medium severity, CVSS 5.9. EPSS: 0.6% chance of exploitation in the next 30 days.

OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.

Affected products

• Opentelemetry Opentelemetry: from 1.13.1, before 1.15.2 (fixed in 1.15.2)

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