CVE-2026-28406
In environments with registry authentication, this can be chained with docker credential helpers to achieve code execution within the executor process.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
- EPSS
- 0.61% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- chainguard/kaniko
- Source
- security-advisories@github.com
References
- https://github.com/chainguard-forks/kaniko/commit/a370e4b1f66e6e842b685c8f70ed507964c4b221Patch
- https://github.com/chainguard-forks/kaniko/pull/326Issue Tracking, Patch
- https://github.com/chainguard-forks/kaniko/security/advisories/GHSA-6rxq-q92g-4rmfPatch, Vendor Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.