CVE-2026-40894 PUBLISHED

OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

Assigner: GitHub_M
Reserved: 15.04.2026 Published: 23.04.2026 Updated: 23.04.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 5.3

Product Status

Vendor open-telemetry
Product opentelemetry-dotnet
Versions
  • Version >= 0.5.0-beta.2, < 1.15.3 is affected
Vendor open-telemetry
Product OpenTelemetry.Api
Versions
  • Version >= 0.5.0-beta.2, < 1.15.3 is affected
Vendor open-telemetry
Product OpenTelemetry.Extensions.Propagators
Versions
  • Version >= 1.3.1, < 1.15.3 is affected

References

Problem Types

  • CWE-789: Memory Allocation with Excessive Size Value CWE