CVE-2026-40891— OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling
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I. Basic Information for CVE-2026-40891
Vulnerability Information
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Vulnerability Title
OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的内存分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenTelemetry .NET 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry .NET是OpenTelemetry公司的OpenTelemetry的.NET客户端。 OpenTelemetry .NET 1.13.1版本至1.15.2之前版本存在安全漏洞，该漏洞源于gRPC导出器在重试处理时解析服务器提供的grpc-status-details-bin trailer，可能导致内存过度分配和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-telemetry | opentelemetry-dotnet | >= 1.13.1, < 1.15.3 | - | |
| open-telemetry | OpenTelemetry.Exporter.OpenTelemetryProtocol | >= 1.13.1, < 1.15.3 | - |
II. Public POCs for CVE-2026-40891
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · open-telemetry · 2026-04-23 · 5 CVEs total
| CVE-2026-41078 | 5.9 MEDIUM | OpenTelemetry dotnet: Potential memory exhaustion via unbounded pooled-list sizing in Jaeg |
| CVE-2026-41173 | 5.9 MEDIUM | Unbounded HTTP response body read in OpenTelemetry.Sampler.AWS |
| CVE-2026-40182 | 5.3 MEDIUM | OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies |
| CVE-2026-40894 | 5.3 MEDIUM | OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation h |
IV. Related Vulnerabilities
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OpenTelemetry .NET has a Denial of Service (DoS) Vulnerabili
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V. Comments for CVE-2026-40891
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