CVE-2026-63308 MEDIUM

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

Vendor Helm
Product helm
Weakness CWE-129
Published July 17, 2026
Last update July 17, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 17, 2026 CVE published
July 17, 2026 Record updated