Vitejs Vite up to 8.3.2 Transform Index Html getHtmlFilename url path traversal

Summaryinfo

A vulnerability identified as critical has been detected in Vitejs Vite up to 6.4.3/7.3.6/8.1.5/8.2.3/8.3.2. Affected by this vulnerability is the function getHtmlFilename of the component Transform Index Html. This manipulation of the argument url causes path traversal. This vulnerability is handled as CVE-2026-112945. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Vitejs Vite up to 6.4.3/7.3.6/8.1.5/8.2.3/8.3.2 and classified as critical. Affected by this vulnerability is the function getHtmlFilename of the component Transform Index Html. The manipulation of the argument url with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Vite is a frontend tooling framework for JavaScript. Prior to 6.4.4, 7.3.7, 8.1.6, 8.2.4, and 8.3.3, applications using custom middleware are vulnerable when they pass an unchanged browser request URL to server.transformIndexHtml. getHtmlFilename uses the query-bearing request URL to resolve an existing local file while preserving attacker-supplied leading slashes in the generated proxy module URL. If the transformed HTML contains an inline module script and a victim browser loads the crafted development-server page, the leading double slash makes the browser fetch and execute an attacker-controlled module in the Vite-served page. This execution can expose sensitive page data or permit critical actions available to the affected application. This issue is fixed in versions 6.4.4, 7.3.7, 8.1.6, 8.2.4, and 8.3.3.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-112945 since 10/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 6.4.4, 7.3.7, 8.1.6, 8.2.4 or 8.3.3 eliminates this vulnerability.

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Productinfo

Vendor

• Vitejs

Name

• Vite

Version

• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 7.3.0
• 7.3.1
• 7.3.2
• 7.3.3
• 7.3.4
• 7.3.5
• 7.3.6
• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.1.4
• 8.1.5
• 8.2.0
• 8.2.1
• 8.2.2
• 8.2.3
• 8.3.0
• 8.3.1
• 8.3.2

Website

• Product: https://github.com/vitejs/vite/

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