open-telemetry opentelemetry-dotnet-contrib up to 1.15.0-beta.1 Response Body AzureVmMetaDataRequestor allocation of resources

Summaryinfo

A vulnerability, which was classified as problematic, was found in open-telemetry opentelemetry-dotnet-contrib up to 1.15.0-beta.1. Affected is the function AzureVmMetaDataRequestor of the component Response Body Handler. The manipulation results in allocation of resources. This vulnerability is cataloged as CVE-2026-41483. The attack may be launched remotely. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in open-telemetry opentelemetry-dotnet-contrib up to 1.15.0-beta.1. It has been classified as problematic. Affected is the function AzureVmMetaDataRequestor of the component Response Body Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-41483 since 04/20/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Vendor

• open-telemetry

Name

• opentelemetry-dotnet-contrib

Version

• 1.15.0-beta.0
• 1.15.0-beta.1

Website

• Product: https://github.com/open-telemetry/opentelemetry-dotnet-contrib/

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