Riskcovery

CVE-2026-40891

OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling

State
Published
Severity
5.3 Medium
Published
Apr 23, 2026
Updated
Apr 23, 2026
Reserved
Apr 15, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.15.3 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HGitHub_M

Weaknesses

  • CWE-789 Memory Allocation with Excessive Size Value

Affected Products

ProductVersions
opentelemetry-dotnetopen-telemetry
  • >= 1.13.1, < 1.15.3Affected
OpenTelemetry.Exporter.OpenTelemetryProtocolopen-telemetry
  • >= 1.13.1, < 1.15.3Affected

References

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