CVE-2026-25121
Description
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.
How to fix
- chainguard apko1.1.1 or later
- chainguard.dev/apko1.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| chainguard apko | 0.14.8 ≤ v < 1.1.1 | 1.1.1 |
| chainguard.dev/apkoGo | 0.14.8 ≤ v < 1.1.0 | 1.1.0 |
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