CVE Catalog

CVE-2026-41483

MediumCVSS 5.9
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.32%

25th percentile - higher than 25% of all known CVEs

Summary

OpenTelemetry.Resources.Azure versions 1.15.0-beta.1 and earlier read the Azure VM instance metadata service response into memory without any size limit. An attacker controlling the endpoint or performing a man-in-the-middle attack can return an arbitrarily large response, causing unbounded heap allocation and potentially terminating the process.

Risk Assessment

This can lead to denial of service (DoS) for .NET applications using this library, causing service disruptions and loss of availability.

Recommendation

Update the library to version 1.15.1-beta.1 or later. As a workaround, disable the Azure VM resource detector or use network-level controls (e.g., firewall rules, mTLS) to prevent MITM attacks.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS