CVE-2026-40894

Name: CVE-2026-40894
Creator: NVD / NIST
Published: 2026-04-23T19:17:28.81+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2026-40894 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.46%

36.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-789

Affected Software

Vendor	Product	Versions
Opentelemetry	Opentelemetry	>= 0.5.0, < 1.15.3
Opentelemetry	Opentelemetry.Api	>= 0.5.0, < 1.15.3
Opentelemetry	Opentelemetry.Extensions.Propagators	> 1.3.0, < 1.15.3

References

https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048Issue Tracking, Patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244Issue Tracking, Patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309Issue Tracking, Patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/533Issue Tracking, Patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061Issue Tracking, Patch
https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569jMitigation, Vendor Advisory

Timeline

Published: Apr 23, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40894?

How severe is CVE-2026-40894?

CVE-2026-40894 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40894?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40894?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST