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CVE-2026-63308medium5.3

Helm Files.Lines Denial of Service via Empty Chart Files

Impact

Helm through 4.2.3 contains a denial of service vulnerability that allows attackers to trigger a panic by including empty files in chart files, causing render failures. Attackers need access to modify chart files. The weakness is due to improper validation of array indices.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

helm · VulnCheck

helm

2 ranges
VulnCheck version evidence

Package identity

pkg:golang/helm.sh/helm/v4Explore helm.sh/helm/v4 →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 4.2.3

semver versions

unaffected

ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017

git versions

unknown

Other versions: unaffected

Original source 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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-63308

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-129 ↗

Improper Validation of Array Index

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:helm:helm:*:*:*:*:*:*:*:*

Through (inclusive): 4.2.3

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:helm:helm:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "4.2.3"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-29
CISA-ADP

Additional data publisher

2026-07-17

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

4 sources
github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017
patchVulnCheck
github.com/helm/helm/issues/32279
technical-descriptionVulnCheck
github.com/helm/helm/pull/32290
issue-trackingVulnCheck
www.vulncheck.com/advisories/helm-files-lines-denial-of-service-via-empty-chart-files
third-party-advisoryVulnCheck