CVE-2026-40894

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.

CVSS 3.1

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

EPSS

0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-26)

CWE

CWE-789

Published

2026-04-23

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• opentelemetry:opentelemetry
• opentelemetry:opentelemetry.api
• opentelemetry:opentelemetry.extensions.propagators

References

• 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

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