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

5.3 / 10

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-40891

Source GitHub_M

Published Apr 23, 2026 at 17:54

Modified Apr 23, 2026 at 18:23

Affected Product

Vendor open-telemetry

Product opentelemetry-dotnet

Version >= 1.13.1, < 1.15.3

Affected Versions open-telemetry opentelemetry-dotnet >= 1.13.1, < 1.15.3
open-telemetry OpenTelemetry.Exporter.OpenTelemetryProtocol >= 1.13.1, < 1.15.3

CWE Classification

CWE-789

References

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    "published": "2026-04-23T17:54:36.033Z",
    "modified": "2026-04-23T18:23:08.858Z",
    "type": "cve",
    "title": "OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling",
    "source": "GitHub_M",
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OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling_CVE-2026-40891