CVE-2026-40182— OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies
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I. Basic Information for CVE-2026-40182
Vulnerability Information
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Vulnerability Title
OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies
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 to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. 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至1.15.2之前版本存在安全漏洞，该漏洞源于OTLP协议导出时响应读取无上限，可能导致内存耗尽。
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, < 1.15.2 | - |
II. Public POCs for CVE-2026-40182
| # | 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-2026-40891 | 5.3 MEDIUM | OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handl |
| CVE-2026-40894 | 5.3 MEDIUM | OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation h |
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V. Comments for CVE-2026-40182
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