CVE-2026-6410: @fastify/static vulnerable to path traversal in directory listing
@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.
Other sources
Impact
@fastify/static v9.1.0 and earlier serves directory listings outside the configured static root when the list option is enabled. A request such as /public/../outside/ causes dirList.path() to resolve a directory outside the root via 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 names and filenames that should not be exposed. File contents are not disclosed.
Patches
Upgrade to @fastify/static >= 9.1.1.
Workarounds
Disable directory listing by removing the list option from the plugin configuration.
— GitHub
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/@fastify/staticto a version that resolves this vulnerability.Fixed in 9.1.1 - Upgrade
Upgrade
@fastify/staticto a version that resolves this vulnerability.Fixed in 9.1.1 - Configuration
Disable directory listing by removing the `list` option from the @fastify/static plugin configuration.
@fastify/static list option = removed
Event History
Frequently Asked Questions
What is the severity of CVE-2026-6410?
The severity of CVE-2026-6410 is considered high due to its potential for directory traversal attacks.
How do I fix CVE-2026-6410?
To fix CVE-2026-6410, upgrade @fastify/static to version 9.2.0 or later.
What versions of @fastify/static are affected by CVE-2026-6410?
CVE-2026-6410 affects @fastify/static versions between 8.0.0 and 9.1.0 inclusive.
What type of vulnerability is CVE-2026-6410?
CVE-2026-6410 is a path traversal vulnerability that allows access to directories outside the configured static root.
How does CVE-2026-6410 impact my application?
CVE-2026-6410 can lead to unauthorized access to sensitive files within the server's file system.