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CVE-2026-40894— OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

Quick assessment

Affected
open-telemetry opentelemetry-dotnet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.3 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-40894

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Vendor Advisories for CVE-2026-40894 (1)

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

IV. Related Vulnerabilities

Same product: opentelemetry-dotnet
Same vendor: open-telemetry
Same weakness: CWE-789

V. Comments for CVE-2026-40894

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