Medium 4.3Published Jul 17, 2026

CVE-2026-63308Helm Files.Lines Denial of Service via Empty Chart Files

Updated under an hour ago (Oct 26, 2026, 9:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-129
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

helm helm helm:helm (from the name)	through 4.2.3; ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017 not affected	CNA record
helm helm helm:helm	through 4.2.3	NVD

References

https://github.com/helm/helm/issues/32279technical-description, exploit, issue-tracking
https://github.com/helm/helm/pull/32290issue-tracking, patch
https://github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017patch
https://www.vulncheck.com/advisories/chat2db-insecure-direct-object-reference-via-get-api-connection-datasourcethird-party-advisory, not-applicable

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.