PT-2026-6368 · Go · Chainguard.Dev/Apko

Published 2026-02-03 · Updated 2026-02-03

OSV

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Fix

Relative Path Traversal

Path traversal

Weakness Enumeration

CWE-23

CWE-22

Related Identifiers

GHSA-5G94-C2WX-8PXW

Affected Products

Chainguard.Dev/Apko

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-25121 · Security Note
• https://osv.dev/vulnerability/GHSA-5g94-c2wx-8pxw · Vendor Advisory
• https://github.com/chainguard-dev/apko · Note
• https://github.com/chainguard-dev/apko/commit/d8b7887a968a527791b3c591ae83928cb49a9f14 · Note
• https://github.com/chainguard-dev/apko/security/advisories/GHSA-5g94-c2wx-8pxw · Note