Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chainguard | Kaniko | >= 1.25.4, < 1.25.10 |
Related Weaknesses (CWE)
References
- https://github.com/chainguard-forks/kaniko/commit/a370e4b1f66e6e842b685c8f70ed50Patch
- https://github.com/chainguard-forks/kaniko/pull/326Issue TrackingPatch
- https://github.com/chainguard-forks/kaniko/security/advisories/GHSA-6rxq-q92g-4rPatchVendor Advisory
FAQ
What is CVE-2026-28406?
CVE-2026-28406 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 u...
How severe is CVE-2026-28406?
CVE-2026-28406 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28406?
Check the references section above for vendor advisories and patch information. Affected products include: Chainguard Kaniko.