{"id":"CVE-2026-35205","aliases":["GHSA-q5jf-9vfq-h4h7","BIT-helm-2026-35205","GO-2026-5566"],"title":"Helm's plugin verification fails open when .prov is missing, allowing unsigned plugin install","summary":"Helm's plugin verification fails open when .prov is missing, allowing unsigned plugin install","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"helm","product":"helm.sh/helm/v4","ecosystem":"go","affected":["helm.sh/helm/v4 >= 4.0.0, < 4.1.4"],"patched":["helm.sh/helm/v4 4.1.4"],"published":"2026-04-10","updated":"2026-07-24","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-q5jf-9vfq-h4h7","references":[{"url":"https://github.com/helm/helm/security/advisories/GHSA-q5jf-9vfq-h4h7"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35205"},{"url":"https://github.com/helm/helm/commit/05fa37973dc9e42b76e1d2883494c87174b6074f"},{"url":"https://github.com/helm/helm"},{"url":"https://github.com/helm/helm/releases/tag/v4.1.4"},{"url":"https://helm.sh/docs/topics/provenance/#the-provenance-file"}],"tags":["osv","go"],"epss":0.0022,"epssPercentile":0.12825,"ingestedAt":"2026-07-25T19:08:11.839Z","slug":"CVE-2026-35205","body":"## Overview\n\nHelm 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.\n\n## Affected packages\n\n- `helm.sh/helm/v4 >= 4.0.0, < 4.1.4`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `helm.sh/helm/v4 4.1.4`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}