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Metalama is a Roslyn-based open-source patterns and architecture toolkit for C#. Prior to 2025.1.18, 2026.0.25 and 2026.1.19, Metalama.Framework and Metalama.Tool load and execute compile-time assemblies, auxiliary executable tools and embedded helper assemblies from predictable temporary directories. On `Linux` and `macOS`, the default `Path.GetTempPath()` location is world-writable, and existing artifacts are trusted based on sentinel or `.completed` marker files rather than integrity verification. A local unprivileged user on a shared machine or CI/build agent can pre-create the deterministic directory structure and plant a malicious DLL with the matching sentinel. When a higher-privileged developer or build account subsequently builds, Metalama skips regeneration and executes the planted artifact in the compiler, IDE or MSBuild process as the building user. This permits cross-user privilege escalation, reading source and secrets, supply-chain tampering with build output, or disrupting builds. Default Windows per-user temporary directories are protected by ACLs and are not affected. Deployer-selected insecure cache locations are outside the vulnerability's scope. This issue is fixed in versions 2025.1.18, 2026.0.25 and 2026.1.19.

• https://github.com/metalama/Metalama/security/advisories/GHSA-m6wq-39m7-9xpp x_refsource_CONFIRM
• https://github.com/metalama/Metalama/pull/1650 x_refsource_MISC
• https://github.com/metalama/Metalama/commit/09911349a916e82194b1cfaa6d0a38acad928fc9 x_refsource_MISC
• https://github.com/metalama/Metalama/commit/92c4feecfce86d18fcb007ab6d3a1b4383326a2e x_refsource_MISC
• https://github.com/metalama/Metalama/releases/tag/release/2025.1.18 x_refsource_MISC
• https://github.com/metalama/Metalama/releases/tag/release/2026.0.25 x_refsource_MISC
• https://github.com/metalama/Metalama/releases/tag/release/2026.1.19 x_refsource_MISC