CVE-2026-40894— OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers
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I. Basic Information for CVE-2026-40894
Vulnerability Information
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Vulnerability Title
OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers
Source: NVD (National Vulnerability Database)
Vulnerability Description
OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTelemetry.Extensions.Propagators 1.3.1 to 1.15.2, The implementation details of the baggage, B3 and Jaeger processing code in the OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators NuGet packages can allocate excessive memory when parsing which could create a potential denial of service (DoS) in the consuming application. This vulnerability is fixed in 1.15.3.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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存在安全漏洞，该漏洞源于baggage、B3和Jaeger处理代码实现细节，可能导致解析时分配过多内存，造成拒绝服务。以下产品及版本受到影响：OpenTelemetry.Api 0.5.0-beta.2版本至1.15.2版本和OpenTelemetry.Extensions.Propagators 1.3.1版本至1.15.2版本。
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 | >= 0.5.0-beta.2, < 1.15.3 | - | |
| open-telemetry | OpenTelemetry.Api | >= 0.5.0-beta.2, < 1.15.3 | - | |
| open-telemetry | OpenTelemetry.Extensions.Propagators | >= 1.3.1, < 1.15.3 | - |
II. Public POCs for CVE-2026-40894
| # | 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-2026-40891 | 5.3 MEDIUM | OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handl |
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V. Comments for CVE-2026-40894
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