Описание
kaniko has tar archive path traversal in its build context extraction, allowing file writes outside destination directories
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 — uses securejoin for path resolution in tar extraction.
Acknowledgements
kaniko thanks Oleh Konko from 1seal for discovering and reporting this issue.
Ссылки
- https://github.com/chainguard-forks/kaniko/security/advisories/GHSA-6rxq-q92g-4rmf
- https://nvd.nist.gov/vuln/detail/CVE-2026-28406
- https://github.com/chainguard-forks/kaniko/pull/326
- https://github.com/chainguard-forks/kaniko/commit/a370e4b1f66e6e842b685c8f70ed507964c4b221
- https://github.com/chainguard-forks/kaniko/releases/tag/v1.25.10
Пакеты
github.com/chainguard-dev/kaniko
>= 1.25.4, < 1.25.10
1.25.10
Связанные уязвимости
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.
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.