CVE-2026-35206

File overwrite via dot-segment chart name

Published Apr 9, 2026 · Updated Apr 9, 2026

Path traversal in Helm 3.20.1 and earlier and 4.0.0 through 4.1.3 allows local users to overwrite output-directory files. The chart expansion path accepts a Chart.yaml name of "." or ".."; SecureJoin then resolves the per-chart directory to the extraction root and copies archive entries there. Exploitation requires a user or process to run helm pull --untar on a crafted chart, and writes remain inside the chosen output directory.

CVSS severity4.4
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Helm 3.20.1 and earlier and 4.0.0 through 4.1.3 allows local users to overwrite output-directory files. The chart expansion path accepts a Chart.yaml name of "." or ".."; SecureJoin then resolves the per-chart directory to the extraction root and copies archive entries there. Exploitation requires a user or process to run helm pull --untar on a crafted chart, and writes remain inside the chosen output directory.

The record

CVE
CVE-2026-35206
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
The Helm Project
Product
Helm
Classifications
CWE-22, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.20.2
  2. Affected versionversion=>= 4.0.0, < 4.1.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Helm Project · Helmversion=< 3.20.2; version=>= 4.0.0, < 4.1.4

Published CVSS scores

4.4NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
4.8GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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