{"schema_version":"1.7.5","id":"GHSA-q5jf-9vfq-h4h7","published":"2026-04-10T15:33:03Z","modified":"2026-07-24T19:11:39.890512397Z","aliases":["BIT-helm-2026-35205","CVE-2026-35205","GO-2026-5566"],"related":["CGA-3wh4-q833-xff6"],"summary":"Helm's plugin verification fails open when .prov is missing, allowing unsigned plugin install","details":"Helm is a package manager for Charts for Kubernetes. In Helm versions >=4.0.0 and <=4.1.3, Helm will install plugins missing provenance (`.prov` file) when signature verification is required.\n\n### Impact\n\nThe bug allows plugin authors to omit provenance (signing) data from plugins, bypassing plugin signature verification upon plugin install/update.\n\nNotably, plugin hooks will be executed as designed on the installed plugin, enabling a malicious plugin to execute arbitrary code.\n\n### Patches\n\nThis issue has been patched in Helm v4.1.4\n\nInstalling/updating a plugin with missing provenance will error if signature verification is required.\n\n### Workarounds\n\nUsers may manually validate that a plugin archive is not missing provenance data (`.prov` file) before installation.","affected":[{"package":{"name":"helm.sh/helm/v4","ecosystem":"Go","purl":"pkg:golang/helm.sh/helm/v4"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.1.4"}]}],"database_specific":{"last_known_affected_version_range":"<= 4.1.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q5jf-9vfq-h4h7/GHSA-q5jf-9vfq-h4h7.json"}}],"references":[{"type":"WEB","url":"https://github.com/helm/helm/security/advisories/GHSA-q5jf-9vfq-h4h7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35205"},{"type":"WEB","url":"https://github.com/helm/helm/commit/05fa37973dc9e42b76e1d2883494c87174b6074f"},{"type":"PACKAGE","url":"https://github.com/helm/helm"},{"type":"WEB","url":"https://github.com/helm/helm/releases/tag/v4.1.4"},{"type":"WEB","url":"https://helm.sh/docs/topics/provenance/#the-provenance-file"}],"database_specific":{"cwe_ids":["CWE-636"],"github_reviewed":true,"github_reviewed_at":"2026-04-10T15:33:03Z","nvd_published_at":"2026-04-09T16:16:27Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}