CVE-2026-40891

OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS). This vulnerability is fixed in 1.15.2.

The following products are affected by CVE-2026-40891 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2026-40891.

URL	Resource
https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p