CVE-2026-40894
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Opentelemetry
PublishedApr 23, 2026
First seenApr 23, 2026
Weakness typeCWE-789CWE-789
How to fix
Update
- opentelemetry opentelemetry1.15.3 or later
- opentelemetry opentelemetry.api1.15.3 or later
- opentelemetry opentelemetry.extensions.propagators1.15.3 or later
- OpenTelemetry.Api1.15.3 or later
- OpenTelemetry.Extensions.Propagators1.15.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| opentelemetry opentelemetry | 0.5.0 ≤ v < 1.15.3 | 1.15.3 |
| opentelemetry opentelemetry.api | 0.5.0 ≤ v < 1.15.3 | 1.15.3 |
| opentelemetry opentelemetry.extensions.propagators | 1.3.0 < v < 1.15.3 | 1.15.3 |
| OpenTelemetry.ApiNuGet | 0.5.0-beta.2 ≤ v < 1.15.3 | 1.15.3 |
| OpenTelemetry.Extensions.PropagatorsNuGet | 1.3.1 ≤ v < 1.15.3 | 1.15.3 |
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