CVE-2026-40894
OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers
- State
- Published
- Severity
- 5.3 Medium
- Published
- Apr 23, 2026
- Updated
- Apr 23, 2026
- Reserved
- Apr 15, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | GitHub_M |
Weaknesses
- CWE-789 Memory Allocation with Excessive Size Value
Affected Products
| Product | Versions |
|---|---|
opentelemetry-dotnetopen-telemetry |
|
OpenTelemetry.Apiopen-telemetry |
|
OpenTelemetry.Extensions.Propagatorsopen-telemetry |
|
References
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j
- 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/533
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.