CVE-2026-28406

Summary

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.

Affected Software

Weaknesses

• CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

kaniko: kaniko: Arbitrary code execution via path traversal in build context archive unpacking

Additional References

• https://access.redhat.com/security/cve/CVE-2026-28406
• https://bugzilla.redhat.com/show_bug.cgi?id=2443462
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28406.json

References

• https://github.com/chainguard-forks/kaniko/security/advisories/GHSA-6rxq-q92g-4rmf
• https://github.com/chainguard-forks/kaniko/pull/326
• https://github.com/chainguard-forks/kaniko/commit/a370e4b1f66e6e842b685c8f70ed507964c4b221

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