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CVE-2026-41484— OpenTelemetry.Exporter.OneCollector vulnerable to denial of service via unbounded HTTP error response body

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 1.15.0及之前版本存在安全漏洞，该漏洞源于HttpJsonPostTransport类在读取错误响应体时无大小限制，可能导致堆分配无界增长，引发高内存压力或进程终止。

CVSS 5.3 · Medium EPSS 0.43% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-telemetry opentelemetry-dotnet-contrib <= 1.15.0 affected
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I. Basic Information for CVE-2026-41484

Vulnerability Information
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Vulnerability Title
OpenTelemetry.Exporter.OneCollector vulnerable to denial of service via unbounded HTTP error response body
Source: CVE Program / CVE List V5
Vulnerability Description
OpenTelemetry.Exporter.OneCollector is a .NET exporter that sends telemetry to a OneCollector back-end over HTTP. In versions 1.15.0 and earlier, when a request to the configured back-end or collector results in an unsuccessful HTTP 4xx or 5xx response, the HttpJsonPostTransport class reads the entire response body into memory with no upper bound on the number of bytes consumed in order to include the error response in operator logs. An attacker who controls the configured endpoint, or who can intercept traffic to it via a man-in-the-middle attack, 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. As a workaround, use network-level controls such as firewall rules, mTLS, or a service mesh to prevent man-in-the-middle attacks on the configured back-end or collector endpoint. This issue is fixed in version 1.15.1, which limits the number of bytes read from the response body in an error condition to 4 MiB.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/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 1.15.0及之前版本存在安全漏洞，该漏洞源于HttpJsonPostTransport类在读取错误响应体时无大小限制，可能导致堆分配无界增长，引发高内存压力或进程终止。
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 <= 1.15.0 -

II. Public POCs for CVE-2026-41484

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III. Intelligence Information for CVE-2026-41484

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Patches & Fixes for CVE-2026-41484 (1)

Vendor Advisories for CVE-2026-41484 (1)

Same Patch Batch · open-telemetry · 2026-05-06 · 3 CVEs total

CVE-2026-41483 5.9 MEDIUM Unbounded HTTP response body read in OpenTelemetry.Resources.Azure
CVE-2026-41310 5.3 MEDIUM OpenTelemetry .NET Zipkin exporter has unbounded remote endpoint cache leading to memory g

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41484

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