CVE-2026-42348
MEDIUMopen-telemetry opentelemetry-dotnet-contrib - OpAMP Client Reads Unbounded HTTP Response Bodies
Title source: ruleDescription
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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-w2jh-77fq-7gp8
X_Refsource_Misc x_refsource_misc
https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116
Scores
CVSS v3
5.9
EPSS
0.0002
EPSS Percentile
4.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-789
Status
published
Products (2)
nuget/OpenTelemetry.OpAmp.Client
0 - 0.2.0-alpha.1NuGet
open-telemetry/opentelemetry-dotnet-contrib
< 0.2.0-alpha.1
Published
May 12, 2026
Tracked Since
May 13, 2026