Vulnerability · Published Apr 23, 2026 · Assigned by GitHub_M
CVE-2026-40182OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies
Medium 5.3
In plain English
A medium-severity security flaw in opentelemetry-dotnet from open-telemetry. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | opentelemetry.exporter.opentelemetryprotocol | 1.15.2 | GHSA-q834-8qmm-v933 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-telemetry | opentelemetry-dotnet | >= 1.13.1, < 1.15.2 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933 x_refsource_CONFIRM
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017 x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-proto/pull/781 x_refsource_MISC