kaniko has tar archive path traversal in its build context extraction, allowing file writes outside destination directories in github.com/chainguard-dev/kaniko

Open Source Vulnerabilities CVE-2026-28406

kaniko is a tool to build container images from a Dockerfile, inside a container or Kubernetes cluster. Starting in version 1.25.4 and prior to version 1.25.10, kaniko unpacks build context archives using `filepath.Join(dest, cleanedName)` without enforcing that the final path stays within `dest`. A tar entry like `../outside.txt` escapes the extraction root and writes files outside the destination directory. In environments with registry authentication, this can be chained with docker credential helpers to achieve code execution within the executor process. Version 1.25.10 uses securejoin for path resolution in tar extraction.

Open Source Vulnerabilities GHSA-6rxq-q92g-4rmf

kaniko unpacks build context archives using `filepath.Join(dest, cleanedName)` without enforcing that the final path stays within `dest`. A tar entry like `../outside.txt` escapes the extraction root and writes files outside the destination directory. In environments with registry authentication, this can be chained with docker credential helpers to achieve code execution within the executor process. Affected versions >= 1.25.4, <= 1.25.9. **Fix:** Merged with [PR #326](https://github.com/chainguard-forks/kaniko/pull/326) — uses securejoin for path resolution in tar extraction. **Acknowledgements** kaniko thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.

Open Source Vulnerabilities GO-2026-4580

kaniko has tar archive path traversal in its build context extraction, allowing file writes outside destination directories in github.com/chainguard-dev/kaniko