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CVE-2026-41173— Unbounded HTTP response body read in OpenTelemetry.Sampler.AWS

Quick assessment

Affected
open-telemetry opentelemetry-dotnet-contrib
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 Contrib是OpenTelemetry - CNCF开源的一个开源遥测数据收集与处理工具库。 OpenTelemetry .NET Contrib 0.1.0-alpha.8之前版本存在安全漏洞，该漏洞源于读取未限制大小的HTTP响应体，可能导致堆内存分配无限制，造成拒绝服务。

CVSS 5.9 · Medium EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-41173

Vulnerability Information
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Vulnerability Title
Unbounded HTTP response body read in OpenTelemetry.Sampler.AWS
Source: CVE Program / CVE List V5
Vulnerability Description
The AWS X-Ray Remote Sampler package provides a sampler which can get sampling configurations from AWS X-Ray. Prior to 0.1.0-alpha.8, OpenTelemetry.Sampler.AWS reads unbounded HTTP response bodies from a configured AWS X-Ray remote sampling endpoint into memory. AWSXRaySamplerClient.DoRequestAsync called HttpClient.SendAsync followed by ReadAsStringAsync(), which materializes the entire HTTP response body into a single in-memory string with no size limit. The sampling endpoint is configurable via AWSXRayRemoteSamplerBuilder.SetEndpoint (default: http://localhost:2000). An attacker who controls the configured endpoint, or who can intercept traffic to it (MitM), can return an arbitrarily large response body. This causes unbounded heap allocation in the consuming process, leading to high transient memory pressure, garbage-collection stalls, or an OutOfMemoryException that terminates the process. This vulnerability is fixed in 0.1.0-alpha.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenTelemetry .NET Contrib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry .NET Contrib是OpenTelemetry - CNCF开源的一个开源遥测数据收集与处理工具库。 OpenTelemetry .NET Contrib 0.1.0-alpha.8之前版本存在安全漏洞，该漏洞源于读取未限制大小的HTTP响应体，可能导致堆内存分配无限制，造成拒绝服务。
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-contrib < 0.1.0-alpha.8 -

II. Public POCs for CVE-2026-41173

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III. Intelligence Information for CVE-2026-41173

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Patches & Fixes for CVE-2026-41173 (1)

Vendor Advisories for CVE-2026-41173 (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-2026-40182 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
CVE-2026-40894 5.3 MEDIUM OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation h

IV. Related Vulnerabilities

Same product: opentelemetry-dotnet-contrib
Same vendor: open-telemetry
Same weakness: CWE-770

V. Comments for CVE-2026-41173

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