{"id":"CVE-2026-35205","aliases":["BIT-helm-2026-35205","GHSA-q5jf-9vfq-h4h7","GO-2026-5566"],"url":"https://o3.security/vulnerability/CVE-2026-35205","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.","published":"2026-04-09T15:06:41.052Z","modified":"2026-08-27T18:26:20.958237105Z","cvss":null,"epss":{"score":0.0022,"percentile":0.12716,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"helm.sh/helm/v4","fixedVersion":"4.1.4"}],"fix":{"url":"https://github.com/helm/helm/commit/05fa37973dc9e42b76e1d2883494c87174b6074f","label":"helm/helm@05fa379"},"references":[{"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"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35205.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26441"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-35205"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35205.json"},{"type":"ADVISORY","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":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2456927"},{"type":"FIX","url":"https://github.com/helm/helm/commit/05fa37973dc9e42b76e1d2883494c87174b6074f"},{"type":"PACKAGE","url":"https://github.com/helm/helm"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T18:26:20.958237105Z"}}