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High, CVSS 7.4

Improper Limitation of a Pathname to a Restricted Directory in Fabric8 Kubernetes Client

CVE-2021-20218GHSA-jwh2-ffg4-48xc

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.fabric8:kubernetes-client 5.0.2, 4.13.2, 4.11.2, 4.7.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Maven io.fabric8:kubernetes-client

    Affected
    >= 4.2.0, <= 4.7.1>= 4.8.0, <= 4.11.1>= 4.12.0, <= 4.13.1>= 5.0.0, <= 5.0.1
    Fixed in
    4.11.2, 4.13.2, 4.7.2, 5.0.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS
  • CVE-2021-20218: 1.31% estimated exploitation activity in the next 30 days; percentile 70.71 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A flaw was found in the fabric8 kubernetes-client in version 4.2.0 and after. This flaw allows a malicious pod/container to cause applications using the fabric8 kubernetes-client copy command to extract files outside the working path. The highest threat from this vulnerability is to integrity and system availability. This has been fixed in kubernetes-client-4.13.2 kubernetes-client-5.0.2 kubernetes-client-4.11.2 kubernetes-client-4.7.2

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-jwh2-ffg4-48xc

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-20218

Advisory: Improper Limitation of a Pathname to a Restricted Directory in Fabric8 Kubernetes Client
IDs: CVE-2021-20218, GHSA-jwh2-ffg4-48xc
Record: https://patchnext.com/advisories/cve-2021-20218 (revision 1, source checked 26 Oct 2026, 16:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.fabric8:kubernetes-client 5.0.2, 4.13.2, 4.11.2, 4.7.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.fabric8:kubernetes-client: affected >= 4.2.0, <= 4.7.1; >= 4.8.0, <= 4.11.1; >= 4.12.0, <= 4.13.1; >= 5.0.0, <= 5.0.1; fixed in 4.11.2, 4.13.2, 4.7.2, 5.0.2

## Suggested inspection (read-only)
- Maven io.fabric8:kubernetes-client: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.fabric8:kubernetes-client.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-jwh2-ffg4-48xc (GitHub-reviewed advisory GHSA-jwh2-ffg4-48xc lists affected ranges: Maven io.fabric8:kubernetes-client >=4.2.0 =4.8.0 =4.12.0 =5.0.0 <=5.0.1)

Commands are suggestions: review each one before running it.

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