CVE-2026-63308
Helm Files.Lines Denial of Service via Empty Chart Files
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 17, 2026
- Updated
- Oct 29, 2026
- Reserved
- Jul 16, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-129 Improper Validation of Array Index
Affected Products
| Product | Versions |
|---|---|
helmhelm |
|
References
- Researcher Disclosuretechnical-descriptionexploit
- Pull Requestissue-tracking
- Patch Commitpatch
- VulnCheck Advisory: Helm Files.Lines Denial of Service via Empty Chart Filesthird-party-advisory
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