CVE-2026-42348 MEDIUM

CVE-2026-42348: OpAMP client reads unbounded HTTP response bodies

Vendor Open-Telemetry
Product opentelemetry-dotnet-contrib
Weakness CWE-789
Published May 12, 2026
Last update May 13, 2026

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated