CVE-2026-41483 Unbounded HTTP response body read in OpenTelemetry.Resources.Azure
An attacker can cause a denial of service by forcing the Azure VM resource detector to consume excessive memory via large HTTP responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41483?
CVE-2026-41483 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-dotnet-contrib, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-41483?
2 open source packages ship an affected version, including OpenTelemetry.Resources.Azure. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
OpenTelemetry.Resources.Azure NuGet | All versions | 1.15.1-beta.1 |
OpenTelemetry.Resources.Azure NuGet | All versions | 1.15.1-beta.1 |
Products include Opentelemetry Opentelemetry.resources.azure.
How do I fix CVE-2026-41483?
Upgrade OpenTelemetry.Resources.Azure to 1.15.1-beta.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-41483 being exploited?
There is no known exploitation of CVE-2026-41483 in the wild and no public exploit code.
Sources
Also known as GHSA-vc24-j8c5-2vw4.