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

CSIRTS triage

What

Empty chart files can cause a denial of service in Helm.

Who is affected

Deployments using Helm with empty chart files.

Urgency

Medium urgency due to a CVSS score of 4.3 indicating moderate severity.

Action

Update to the latest version of Helm to mitigate this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

medium — CVSS 4.3

Published

2026-07-14

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63308

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-633080.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• low[NEW] [low] helm: Vulnerability allows Denial of Servicecert-bund
• mediumCVE-2026-63308: Helm through 4.2.3, fixed in commit ba6c9a2, contains a denial of service vulnerability in the…nvd

More from Microsoft Security Response Center

• highCVE-2026-57992: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability2026-07-14
• mediumCVE-2026-59926: Mistune: XSS via unescaped class option in Admonition directive2026-07-14
• mediumCVE-2026-55003: Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability2026-07-14
• highCVE-2026-42900: Microsoft Windows App Store Elevation of Privilege Vulnerability2026-07-14
• unknownCVE-2026-13867: Chromium: CVE-2026-13867 Inappropriate implementation in Geolocation2026-07-14