CVE-2026-42348 PUBLISHED

OpAMP client reads unbounded HTTP response bodies

Assigner: GitHub_M
Reserved: 26.04.2026 Published: 12.05.2026 Updated: 12.05.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 5.9

Product Status

Vendor open-telemetry
Product opentelemetry-dotnet-contrib
Versions
  • Version < 0.2.0-alpha.1 is affected

References

Problem Types

  • CWE-789: Memory Allocation with Excessive Size Value CWE