fastify static up to 9.1.0 Directory Listing dirList.path path traversal

Summaryinfo

A vulnerability described as critical has been identified in fastify static up to 9.1.0. This issue affects the function dirList.path of the component Directory Listing Handler. Executing a manipulation can lead to path traversal. This vulnerability is tracked as CVE-2026-6410. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in fastify static up to 9.1.0. This vulnerability affects the function dirList.path of the component Directory Listing Handler. The manipulation 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. CVE summarizes:

@fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a containment check. A remote unauthenticated attacker can obtain directory listings for arbitrary directories accessible to the Node.js process, disclosing directory and file names. File contents are not disclosed. Upgrade to @fastify/static 9.1.1 to fix this issue. As a workaround, disable directory listing by removing the list option from the plugin configuration.

The weakness was disclosed by yuki-matsuhashi as GHSA-pr96-94w5-mx2h. The advisory is available at github.com. This vulnerability was named CVE-2026-6410 since 04/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 9.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• fastify

Name

• static

Version

• 9.0
• 9.1.0

CPE 2.3info

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• 🔒

CPE 2.2info

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• 🔒

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