Creation of Temporary File in Directory with Insecure Permissions Affecting opentelemetry.exporter.opentelemetryprotocol package, versions [1.8.0,1.15.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-DOTNET-OPENTELEMETRYEXPORTEROPENTELEMETRYPROTOCOL-16345356
- published3 May 2026
- disclosed30 Apr 2026
- creditUnknown
Introduced: 30 Apr 2026
NewCVE-2026-42191 (opens in a new tab)How to fix?
Upgrade OpenTelemetry.Exporter.OpenTelemetryProtocol to version 1.15.3 or higher.
Overview
OpenTelemetry.Exporter.OpenTelemetryProtocol is an OTLP Exporter for OpenTelemetry .NET.
Affected versions of this package are vulnerable to Creation of Temporary File in Directory with Insecure Permissions in the ExperimentalOptions() used in handling disk retry storage for telemetry data, which falls back to writing to a shared temp location when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk is set and OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not configured. An attacker on a multi-user system can inject malicious blob files, access sensitive telemetry data, or cause gradual disk exhaustion by exploiting the application's retry interval to write or read files in the shared temporary directory.
Workaround
This vulnerability can be mitigated by configuring a dedicated directory with strict access controls for disk retry storage.