apko has a path traversal in apko dirFS which allows filesystem writes outside base

高 7.5CVE-2026-25121 · GHSA-5g94-c2wx-8pxw · GO-2026-4405 · 04/02/2026 公開 · 17/06/2026 更新

要点

CVE-2026-25121 は chainguard.dev/apko, apko (chainguard) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.41%（全脆弱性の 35.6% より高い）。
対処：1.1.0, 1.1.1 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
chainguard.dev/apko Go	`≥ 0.14.8, < 1.1.0`	`1.1.0`
apko chainguard	`≥ 0.14.8, < 1.1.1`	`1.1.1`

概要

A Path Traversal vulnerability was discovered in apko's dirFS filesystem abstraction. An attacker who can supply a malicious APK package (e.g., via a compromised or typosquatted repository) could create directories or symlinks outside the intended installation root. The MkdirAll, Mkdir, and Symlink methods in pkg/apk/fs/rwosfs.go use filepath.Join() without validating that the resulting path stays within the base directory.

Fix: Fixed by d8b7887. Merged into release.

Acknowledgements

apko thanks Oleh Konko from 1seal for discovering and reporting this issue.

NVD の説明

apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before 1.1.1, a path traversal vulnerability was discovered in apko's dirFS filesystem abstraction. An attacker who can supply a malicious APK package (e.g., via a compromised or typosquatted repository) could create directories or symlinks outside the intended installation root. The MkdirAll, Mkdir, and Symlink methods in pkg/apk/fs/rwosfs.go use filepath.Join() without validating that the resulting path stays within the base directory. This issue has been patched in version 1.1.1.