CVE-2026-40891
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Opentelemetry
PublishedApr 23, 2026
First seenApr 23, 2026
Weakness typeCWE-789CWE-789
How to fix
Update
- opentelemetry opentelemetry1.15.3 or later
- OpenTelemetry.Exporter.OpenTelemetryProtocol1.15.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| opentelemetry opentelemetry | 1.13.1 ≤ v < 1.15.3 | 1.15.3 |
| OpenTelemetry.Exporter.OpenTelemetryProtocolNuGet | 1.13.1 ≤ v < 1.15.3 | 1.15.3 |
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