Medium severity5.9GHSA Advisory· Published May 12, 2026· Updated May 27, 2026
CVE-2026-42348
CVE-2026-42348
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
OpenTelemetry.OpAmp.ClientNuGet | < 0.2.0-alpha.1 | 0.2.0-alpha.1 |
Affected products
3- Range: < 0.2.0-alpha.1
- cpe:2.3:a:opentelemetry:opentelemetry.opamp.client:*:*:*:*:*:.net:*:*Range: <0.2.0
Patches
Vulnerability mechanics
References
5- github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-w2jh-77fq-7gp8nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-w2jh-77fq-7gp8ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42348ghsaADVISORY
- github.com/open-telemetry/opentelemetry-dotnet-contrib/commit/bf1fad4fa298ff451cda0efb0ee9c7a7eb46212aghsaWEB
- github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116nvdIssue TrackingWEB
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