CVE-2026-42348: Opentelemetry Opentelemetry.opamp.client

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured OpAMP server is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned in the response. This vulnerability is fixed in 0.2.0-alpha.1.

Affected products

• Opentelemetry Opentelemetry.opamp.client: before 0.2.0 (fixed in 0.2.0)

Published 2026-05-12. Last modified 2026-06-17.