Vulnerability in Helm
CVE-2026-63308
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Helm — versions 0, ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017
Weakness classification (CWE)
References
- github.com/helm/helm/issues/32279 (Exploit, technical-description, exploit, Issue Tracking)
- github.com/helm/helm/pull/32290 (issue-tracking, Patch, Issue Tracking)
- github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017 (Patch, patch)
- www.vulncheck.com/advisories/chat2db-insecure-direct-object-reference-via-get-a… (Not Applicable, third-party-advisory)
Frequently asked questions
- What is CVE-2026-63308?
- CVE-2026-63308 is a medium-severity vulnerability in Helm, classified under Improper Validation of Array Index. CVSS score: 4.3/10. Published 2026-07-17.
- How severe is CVE-2026-63308?
- Medium severity. CVSS v3 base score is 4.3 out of 10.