CVE-2026-35204
From 4.0.0 to 4.1.3, a specially crafted Helm plugin, when installed or updated, will cause Helm to write the contents of the plugin to an arbitrary filesystem location.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Helm is a package manager for Charts for Kubernetes. From 4.0.0 to 4.1.3, a specially crafted Helm plugin, when installed or updated, will cause Helm to write the contents of the plugin to an arbitrary filesystem location. To prevent this, validate that the plugin.yaml of the Helm plugin does not include a version: field containing POSIX dot-dot path separators ie. "/../". This vulnerability is fixed in 4.1.4.
- CVSS 4.0
- 8.4 HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.20% probability · 10th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- helm/helm
- Source
- security-advisories@github.com
References
- https://github.com/helm/helm/commit/36c8539e99bc42d7aef9b87d136254662d04f027Patch
- https://github.com/helm/helm/releases/tag/v4.1.4Product, Release Notes
- https://github.com/helm/helm/security/advisories/GHSA-vmx8-mqv2-9gmgMitigation, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:26441
- https://access.redhat.com/security/cve/CVE-2026-35204
- https://bugzilla.redhat.com/show_bug.cgi?id=2456933
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35204.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.