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CVE-2026-41483— Unbounded HTTP response body read in OpenTelemetry.Resources.Azure

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是OpenTelemetry开源的一个供应商中立的开源可观测性框架。 OpenTelemetry 1.15.0-beta.1及之前版本存在安全漏洞，该漏洞源于AzureVmMetaDataRequestor类在读取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 5.9 · Medium EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-telemetry opentelemetry-dotnet-contrib <= 1.15.0-beta.1 affected
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I. Basic Information for CVE-2026-41483

Vulnerability Information
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Vulnerability Title
Unbounded HTTP response body read in OpenTelemetry.Resources.Azure
Source: CVE Program / CVE List V5
Vulnerability Description
OpenTelemetry.Resources.Azure is the .NET resource detector for Azure environments. In versions 1.15.0-beta.1 and earlier, the AzureVmMetaDataRequestor class makes HTTP requests to the Azure VM instance metadata service and reads the response body into memory without any size limit. 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, disable the Azure VM resource detector or use network-level controls such as firewall rules, mTLS, or a service mesh to prevent man-in-the-middle attacks on the Azure VM instance metadata endpoint. This issue is fixed in version 1.15.1-beta.1, which streams responses rather than buffering them entirely in memory and ignores responses larger than 4 MiB.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry是OpenTelemetry开源的一个供应商中立的开源可观测性框架。 OpenTelemetry 1.15.0-beta.1及之前版本存在安全漏洞，该漏洞源于AzureVmMetaDataRequestor类在读取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-beta.1 -

II. Public POCs for CVE-2026-41483

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III. Intelligence Information for CVE-2026-41483

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Patches & Fixes for CVE-2026-41483 (1)

Vendor Advisories for CVE-2026-41483 (1)

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

CVE-2026-41484 5.3 MEDIUM OpenTelemetry.Exporter.OneCollector vulnerable to denial of service via unbounded HTTP err
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-2026-41483

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