What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-17 · updated 2026-10-29
• Weakness: CWE-129

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.

Affected products

• helm: through 4.2.3
• helm: through 4.2.3

References

• https://github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017
• https://github.com/helm/helm/issues/32279
• https://github.com/helm/helm/pull/32290
• https://www.vulncheck.com/advisories/helm-files-lines-denial-of-service-via-empty-chart-files

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