Description

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.

INFO

Published Date :

2026-04-23T17:54:36.033Z

Last Modified :

2026-04-23T18:23:08.858Z

Source :

GitHub_M
AFFECTED PRODUCTS

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

Vendors Products
Opentelemetry
  • Opentelemetry
  • Opentelemetry-dotnet
  • Opentelemetry.exporter.opentelemetryprotocol
REFERENCES

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