CVE-2026-41484 OpenTelemetry.Exporter.OneCollector vulnerable to denial of service via unbounded HTTP error response body
An attacker controlling the telemetry endpoint can cause a denial of service by sending large HTTP error responses, leading to memory exhaustion in applications using the OpenTelemetry OneCollector exporter.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41484?
CVE-2026-41484 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-dotnet-contrib, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-41484?
2 open source packages ship an affected version, including OpenTelemetry.Exporter.OneCollector. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
OpenTelemetry.Exporter.OneCollector NuGet | All versions | 1.15.1 |
OpenTelemetry.Exporter.OneCollector NuGet | All versions | 1.15.1 |
Products include Opentelemetry Opentelemetry.exporter.onecollector.
How do I fix CVE-2026-41484?
Upgrade OpenTelemetry.Exporter.OneCollector to 1.15.1 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-2026-41484 being exploited?
There is no known exploitation of CVE-2026-41484 in the wild and no public exploit code.
Sources
Also known as GHSA-55m9-299j-53c7.