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

CAO 7.5CVE-2026-25121 · GHSA-5g94-c2wx-8pxw · GO-2026-4405 · Công bố 04/02/2026 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2026-25121 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng chainguard.dev/apko, apko (chainguard).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.41%, cao hơn 35.6% các lỗ hổng khác.
Cách xử lý: cập nhật lên 1.1.0, 1.1.1 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
chainguard.dev/apko Go	`≥ 0.14.8, < 1.1.0`	`1.1.0`
apko chainguard	`≥ 0.14.8, < 1.1.1`	`1.1.1`

Mô tả

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.

Mô tả của NVD

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.