Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Opentelemetry | Opentelemetry | >= 1.13.1, < 1.15.3 |
Related Weaknesses (CWE)
References
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980Issue TrackingPatch
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064Issue TrackingPatch
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-Vendor AdvisoryMitigation
FAQ
What is CVE-2026-40891?
CVE-2026-40891 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2026-40891?
CVE-2026-40891 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40891?
Check the references section above for vendor advisories and patch information. Affected products include: Opentelemetry Opentelemetry.