CVE-2026-50267: Steeltoeoss Steeltoe.configuration.abstractions

Medium severity, CVSS 4.7. EPSS: 0.1% chance of exploitation in the next 30 days.

Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Configuration.Abstractions 4.0.0 through 4.1.0, when MySQL or PostgreSQL service bindings from `VCAP_SERVICES` include TLS client credentials, the Connectors library writes those credentials to temporary files in `Path.GetTempPath()` using `File.CreateText`. On Linux, `File.CreateText` creates files with mode `0644` (world-readable) under the process umask, and the files are never deleted. The same key material is protected at mode `0400` in `/proc/<pid>/environ`. Steeltoe.Configuration.Abstractions version 4.2.0 patches the issue. If an immediate upgrade is not possible, prevent other processes from running in the container under a different UID with access to `/tmp`.

Affected products

• Steeltoeoss Steeltoe.configuration.abstractions: from 4.0.0, before 4.2.0 (fixed in 4.2.0)

Published 2026-06-17. Last modified 2026-06-22.