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NVD / CVE Program· CNA VulnCheck

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

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.48% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 cert-manager 1.12.15-11 on Azure Linux 3.0 1.12.15-11.

Low priority for now. Upgrade to azl3 cert-manager 1.12.15-11 on Azure Linux 3.0 1.12.15-11 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v4.0—No exploit Fix available
Published
Jul 17, 2026
Updated
Oct 29, 2026
EPSS
0.4% · 41th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
5.3
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-63308

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
helmhelm

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • helm helmup to 4.2.3 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • helm helm

    • ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017not affected
    • up to and including 4.2.3affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 16.0helmbefore 3.21.3-160000.2.13.21.3-160000.2.1
openSUSE:Tumbleweedhelmbefore 4.2.3-4.14.2.3-4.1
openSUSE:Tumbleweedhelm3before 3.21.3-4.13.21.3-4.1
Red Hat:hummingbird:1helm3before 0:3.21.3-0.1.2.hum10:3.21.3-0.1.2.hum1
Red Hat:hummingbird:1helm3before 0:3.21.4-0.1.hum10:3.21.4-0.1.hum1
Red Hat:hummingbird:1helm4before 0:4.2.3-0.1.2.hum10:4.2.3-0.1.2.hum1
SUSE:Linux Enterprise Micro 5.5helmbefore 3.21.3-150000.1.93.13.21.3-150000.1.93.1
SUSE:Linux Micro 6.0helmbefore 3.21.3-2.13.21.3-2.1
SUSE:Linux Micro 6.1helmbefore 3.21.3-slfo.1.1_2.13.21.3-slfo.1.1_2.1
SUSE:Linux Micro 6.2c-aresbefore 1.34.8-160000.1.11.34.8-160000.1.1
SUSE:Linux Micro 6.2helmbefore 3.21.3-160000.2.13.21.3-160000.2.1

Same product

helm: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-18658In Helm 2.x before 2.15.2, commands that deal with loading a chart as a directory or packaging a chart provide an opportunity for a maliciou
    40Plan
  • CVE-2019-1010275helm Before 2.7.2 is affected by: CWE-295: Improper Certificate Validation.
    39Monitor
  • CVE-2025-53547Helm Chart Dependency Updating With Malicious Chart.yaml Content And Symlink Can Lead To Code Execution
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-35204Apr 9, 2026 · Helm has a path traversal in plugin metadata version enables arbitrary file write outside Helm plugin directory
    33Monitor
  • ← EarlierCVE-2026-35205Apr 9, 2026 · Helm's plugin verification fails open when .prov is missing, allowing unsigned plugin install
    33Monitor
  • ← EarlierCVE-2026-35206Apr 9, 2026 · Helm Chart extraction output directory collapse via `Chart.yaml` name dot-segment
    19Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 cert-manager 1.12.15-11 on Azure Linux 3.01.12.15-11 · CBL-Mariner ReleasesMicrosoft (MSRC)
opensuse:helm4.2.3-4.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:helm33.21.3-4.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:helm30:3.21.3-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:helm40:4.2.3-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:c-ares1.34.8-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:helm3.21.3-2.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-129 · Improper Validation of Array Index

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records