{"id":"CVE-2026-63308","title":"Helm Files.Lines Denial of Service via Empty Chart Files","summary":"Helm through 4.2.3, fixed in commit ba6c9a2, contains a denial of service vulnerability in the Files.Lines template helper in pkg/engine/files.go that allows attackers to trigger an index out of range panic by including zero-length byte …","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-129"],"vendor":"helm","product":"helm","affected":["helm <= 4.2.3"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-17T17:25:36.932375Z"},"exploitAvailable":true,"published":"2026-07-17","updated":"2026-10-29","sourceUpdated":"2026-10-29T21:16:18.580Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63308","references":[{"url":"https://github.com/helm/helm/issues/32279","label":"Researcher Disclosure"},{"url":"https://github.com/helm/helm/pull/32290","label":"Pull Request"},{"url":"https://github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/helm-files-lines-denial-of-service-via-empty-chart-files","label":"VulnCheck Advisory: Helm Files.Lines Denial of Service via Empty Chart Files"}],"tags":["cve.org","exploit-available"],"epss":0.00486,"epssPercentile":0.41857,"ingestedAt":"2026-11-03T08:39:35.578Z","slug":"CVE-2026-63308","body":"## Overview\n\nHelm through 4.2.3, fixed in commit ba6c9a2, contains a denial of service vulnerability in the Files.Lines template helper in pkg/engine/files.go that allows attackers to trigger an index out of range panic by including zero-length byte slices in chart files. Attackers can include empty files in Helm charts to cause deterministic render failures across template, install, upgrade, lint, and SDK Engine.Render operations.\n\n## Affected\n\n- `helm <= 4.2.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}