melange pipeline working-directory could allow command injection

Open Source Vulnerabilities CVE-2026-24844

melange allows users to build apk packages using declarative pipelines. From version 0.3.0 to before 0.40.3, an attacker who can provide build input values, but not modify pipeline definitions, could execute arbitrary shell commands if the pipeline uses ${{vars.*}} or ${{inputs.*}} substitutions in working-directory. The field is embedded into shell scripts without proper quote escaping. This issue has been patched in version 0.40.3.

Open Source Vulnerabilities GO-2026-4408

melange pipeline working-directory could allow command injection in chainguard.dev/melange

Open Source Vulnerabilities GHSA-vqqr-rmpc-hhg2

An attacker who can provide build input values, but not modify pipeline definitions, could execute arbitrary shell commands if the pipeline uses `${{vars.*}}` or `${{inputs.*}}` substitutions in `working-directory`. The field is embedded into shell scripts without proper quote escaping. **Fix:** Fixed with [e51ca30c](https://github.com/chainguard-dev/melange/commit/e51ca30cfb63178f5a86997d23d3fff0359fa6c8), Released. **Acknowledgements** melange thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.