Vulnerability in Open-telemetry Opentelemetry-dotnet-contrib

CVE-2026-42348

OpenTelemetry.OpAmp.Client is the OpAMP client for OpenTelemetry .NET. Prior to 0.2.0-alpha.1, when receiving responses from the OpAMP server over HTTP, the OpAMP client allocates an unbounded buffer to read all bytes from the server, with…

EPSS: 0.000 (4.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-42348?
CVE-2026-42348 is a medium-severity vulnerability in Open-telemetry Opentelemetry-dotnet-contrib, classified under CWE-789. CVSS score: 5.9/10. Published 2026-05-12.
How severe is CVE-2026-42348?
Medium severity. CVSS v3 base score is 5.9 out of 10.