GHSA-6rxq-q92g-4rmf

kaniko has tar archive path traversal in its build context extraction, allowing file writes outside destination directories

Source: GitHub Advisory Database (reviewed) High CVE-2026-28406

Packages

Ecosystem	Package	Affected	Fixed in
Go	github.com/chainguard-dev/kaniko	>= 1.25.4, < 1.25.10	1.25.10

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.