Vulnerability in Open-Telemetry Opentelemetry.api

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.

EPSS: 0.005 (38.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-40894?
CVE-2026-40894 is a medium-severity vulnerability in Open-Telemetry Opentelemetry.api, classified under CWE-789. CVSS score: 5.3/10. Published 2026-04-23.
How severe is CVE-2026-40894?
Medium severity. CVSS v3 base score is 5.3 out of 10.