medium5.3
CVE-2026-40894
OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers
Impact
OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTelemetry.Extensions.Propagators 1.3.1 to 1.15.2, The implementation details of the baggage, B3 and Jaeger processing code in the OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators NuGet packages can allocate excessive memory when parsing which could create a potential denial of service (DoS) in the consuming application. This vulnerability is fixed in 1.15.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | OpenTelemetry.Api | >= 0.5.0-beta.2, < 1.15.3 | 1.15.3 |
| nuget | OpenTelemetry.Extensions.Propagators | >= 1.3.1, < 1.15.3 | 1.15.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Opentelemetry | Opentelemetry | from 0.5.0 before 1.15.3 |
| Opentelemetry | Opentelemetry.Api | from 0.5.0 before 1.15.3 |
| Opentelemetry | Opentelemetry.Extensions.Propagators | after 1.3.0 before 1.15.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-g94r-2vxg-569j
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j
- https://nvd.nist.gov/vuln/detail/CVE-2026-40894
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3533
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/533
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061
- https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.15.3