Threat Intelligence Database

CVE-2026-42348 is a medium severity vulnerability in the OpenTelemetry. OpAmp. Client component of opentelemetry-dotnet-contrib versions prior to 0.2.0-alpha.1. The issue involves the client allocating an unbounded buffer to read HTTP responses from the OpAMP server without an upper size limit. This can lead to memory exhaustion if the server is attacker-controlled or if a network attacker can intercept and send a very large response body. The vulnerability is fixed starting from version 0.2.

The AWS X-Ray Remote Sampler package provides a sampler which can get sampling configurations from AWS X-Ray. Prior to 0.1.0-alpha.8, OpenTelemetry.Sampler.AWS reads unbounded HTTP response bodies from a configured AWS X-Ray remote sampling endpoint into memory. AWSXRaySamplerClient.DoRequestAsync called HttpClient.SendAsync followed by ReadAsStringAsync(), which materializes the entire HTTP response body into a single in-memory string with no size limit. The sampling endpoint is configurable via AWSXRayRemoteSamplerBuilder.SetEndpoint (default: http://localhost:2000). An attacker who controls the configured endpoint, or who can intercept traffic to it (MitM), can return an arbitrarily large response body. This causes unbounded heap allocation in the consuming process, leading to high transient memory pressure, garbage-collection stalls, or an OutOfMemoryException that terminates the process. This vulnerability is fixed in 0.1.0-alpha.8.