CVE-2026-35206: Helm Chart extraction output directory collapse via `Chart.yaml` name dot-segment

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-09 · updated 2026-06-17
Weakness: CWE-22

Description

Helm is a package manager for Charts for Kubernetes. In Helm versions <=3.20.1 and <=4.1.3, a specially crafted Chart will cause helm pull --untar [chart URL | repo/chartname] to write the Chart's contents to the immediate output directory (as defaulted to the current working directory; or as given by the --destination and --untardir flags), rather than the expected output directory suffixed by the chart's name. This vulnerability is fixed in 3.20.2 and 4.1.4.

Affected products

helm: before 3.20.2; from 4.0.0 before 4.1.4 — fixed in 3.20.2, 4.1.4

How to fix

Upgrade to a fixed version: helm 3.20.2, 4.1.4. Check the vendor advisory for mitigations.

References

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