medium5.3
CVE-2026-40891
OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | OpenTelemetry.Exporter.OpenTelemetryProtocol | >= 1.13.1, < 1.15.3 | 1.15.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Opentelemetry | Opentelemetry | from 1.13.1 before 1.15.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-mr8r-92fq-pj8p
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
- https://nvd.nist.gov/vuln/detail/CVE-2026-40891
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064