What’s Vulnerable › Vulnerabilities

CVE-2026-28406: kaniko has tar archive path traversal in build context extraction allows writing files outside destination directory

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-27 · updated 2026-07-15
• Weakness: CWE-22

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.

Affected products

• chainguard-forks kaniko: from 1.25.4 before 1.25.10 — fixed in 1.25.10

How to fix

Upgrade to a fixed version: chainguard-forks kaniko 1.25.10. Check the vendor advisory for mitigations.

References

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

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