NVD / CVE Program· CNA GitHub_M

CVE-2026-35206: Helm Chart extraction output directory collapse via `Chart.yaml` name dot-segment

Noroxi assessment

Priority: Monitor (action score 19/100)

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: 0.19% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
Fixed version: helm helm 3.20.2; cbl2 helm 3.14.2-10 on CBL Mariner 2.0 3.14.2-11; cbl2 helm 3.14.2-10 on CBL-Mariner 2.0 3.14.2-11.

Low priority for now. Upgrade to helm helm 3.20.2; cbl2 helm 3.14.2-10 on CBL Mariner 2.0 3.14.2-11; cbl2 helm 3.14.2-10 on CBL-Mariner 2.0 3.14.2-11 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 is a package manager for Charts for Kubernetes. In Helm versions <=3.20.1 and <=4.1.3, a specially crafted Chart will cause helm pull --untar [chart URL | repo/chartname] to write the Chart's contents to the immediate output directory (as defaulted to the current working directory; or as given by the --destination and --untardir flags), rather than the expected output directory suffixed by the chart's name. This vulnerability is fixed in 3.20.2 and 4.1.4.

MediumCVSS 4.8 · v4.0—No exploit Fix available

Path traversal

Published: Apr 9, 2026
Updated: Jun 17, 2026
EPSS: 0.1% · 9th percentile
CWE: CWE-22

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 19 / 40 · 4.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 4.8; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/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

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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.

Vendor	Product	CPE
helm	helm	cpe:2.3:a:helm:helm

Affected versions

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

helm helmbefore 3.20.2
helm helm4.0.0 and later · before 4.1.4

Versions reported by the vendor

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

helm helm
- >= 4.0.0, < 4.1.4, < 3.20.2affected

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Go	helm.sh/helm/v3	before 3.20.2	3.20.2
Go	helm.sh/helm/v4	before 4.1.4	4.1.4
openSUSE:Leap 16.0	govulncheck-vulndb	before 0.0.20260727T201416-160000.1.1	0.0.20260727T201416-160000.1.1
openSUSE:Leap 16.0	helm	before 4.3.0-160000.1.1	4.3.0-160000.1.1
openSUSE:Tumbleweed	helm	before 4.1.4-2.1	4.1.4-2.1
openSUSE:Tumbleweed	helm3	before 3.20.2-1.1	3.20.2-1.1
SUSE:Linux Enterprise Micro 5.5	helm	before 3.20.2-150000.1.71.2	3.20.2-150000.1.71.2
SUSE:Linux Enterprise Server 16.0	govulncheck-vulndb	before 0.0.20260727T201416-160000.1.1	0.0.20260727T201416-160000.1.1
SUSE:Linux Enterprise Server 16.0	helm	before 3.20.2-160000.1.1	3.20.2-160000.1.1
SUSE:Linux Micro 6.1	helm	before 4.3.0-slfo.1.1_1.1	4.3.0-slfo.1.1_1.1
SUSE:Linux Micro 6.2	helm	before 4.3.0-160000.1.1	4.3.0-160000.1.1

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
Later →CVE-2026-63308Jul 17, 2026 · Helm Files.Lines Denial of Service via Empty Chart Files
21Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
helm helm	3.20.2 · description	Vendor (CNA)
cbl2 helm 3.14.2-10 on CBL Mariner 2.0	3.14.2-11 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 helm 3.14.2-10 on CBL-Mariner 2.0	3.14.2-11 · Release Notes	Microsoft (MSRC)
Go:helm.sh/helm/v3	3.20.2	Package registry (OSV)
Go:helm.sh/helm/v4	4.1.4	Package registry (OSV)
opensuse:govulncheck-vulndb	0.0.20260727T201416-160000.1.1 · openSUSE:Leap 16.0	Package registry (OSV)
opensuse:helm	4.1.4-2.1 · openSUSE:Tumbleweed	Package registry (OSV)
opensuse:helm3	3.20.2-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
suse:govulncheck-vulndb	0.0.20260727T201416-160000.1.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)
suse:helm	3.20.2-150000.1.71.2 · SUSE:Linux Enterprise Micro 5.5	Package 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

helm/helmcommit 4e7994d

Credits

All researchers

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

No credits in the CNA record.

Variant candidates

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

CVE-2026-352040 days apartHelm has a path traversal in plugin metadata version enables arbitrary file write outside Helm plugin directory
33Monitor

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

Someone with local access to the system can trigger it.
No account or password is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Local
Attack complexity: Low
Privileges required: None
User interaction: P
Scope: X

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/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

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

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References

github.com/helm/helm/commit/4e7994d4467182f535b6797c94b5b0e994a91436

Show all references (2 more)

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

All records