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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (45.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Open-Telemetry Opentelemetry.api — versions >= 0.5.0-beta.2, < 1.15.3
- Open-Telemetry Opentelemetry-Dotnet — versions >= 0.5.0-beta.2, < 1.15.3
- Open-Telemetry Opentelemetry.extensions.propagators — versions >= 1.3.1, < 1.15.3
- Opentelemetry
- Opentelemetry Opentelemetry.api
- Opentelemetry Opentelemetry.extensions.propagators
Weakness classification (CWE)
References
- github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2v… (Mitigation, Vendor Advisory)
- github.com/open-telemetry/opentelemetry-dotnet/pull/1048 (Patch, Issue Tracking)
- github.com/open-telemetry/opentelemetry-dotnet/pull/3244 (Patch, Issue Tracking)
- github.com/open-telemetry/opentelemetry-dotnet/pull/3309 (Patch, Issue Tracking)
- github.com/open-telemetry/opentelemetry-dotnet/pull/533 (Patch, Issue Tracking)
- github.com/open-telemetry/opentelemetry-dotnet/pull/7061 (Patch, Issue Tracking)
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.