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

Quick assessment

Affected
helm helm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Helm是helm团队开源的一款Kubernetes包管理器。 Helm 4.2.3及之前版本存在输入验证错误漏洞，该漏洞源于Files.Lines模板助手在pkg/engine/files.go中处理零长度字节切片时可能导致索引超出范围，攻击者通过在chart文件中包含空文件触发拒绝服务攻击。

CVSS 4.3 · Medium EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
helm helm ≤ 4.2.3 affected
ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017 unaffected
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I. Basic Information for CVE-2026-63308

Vulnerability Information
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Vulnerability Title
Helm Files.Lines Denial of Service via Empty Chart Files
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Helm 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Helm是helm团队开源的一款Kubernetes包管理器。 Helm 4.2.3及之前版本存在输入验证错误漏洞，该漏洞源于Files.Lines模板助手在pkg/engine/files.go中处理零长度字节切片时可能导致索引超出范围，攻击者通过在chart文件中包含空文件触发拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
helm helm 0 ~ 4.2.3 -

II. Public POCs for CVE-2026-63308

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III. Intelligence Information for CVE-2026-63308

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Patches & Fixes for CVE-2026-63308 (3)

Vendor Advisories for CVE-2026-63308 (1)

IV. Related Vulnerabilities

Same product: helm
Same vendor: helm
Same weakness: CWE-129

V. Comments for CVE-2026-63308

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