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bdu:2021-05367

cnvd-2021-88948

EUVD-2026-23249

fkie_cve-2021-22964

A redirect vulnerability in the `fastify-static` module version >= 4.2.4 and < 4.4.1 allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash `//` followed by a domain: `http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e`.A DOS vulnerability is possible if the URL contains invalid characters `curl --path-as-is "http://localhost:3000//^/.."`The issue shows up on all the `fastify-static` applications that set `redirect: true` option. By default, it is `false`.

GHSA-pgh6-m65r-2rhq — DOS and Open Redirect with user input

Affected: npm: fastify-static

### Impact

A redirect vulnerability in the `fastify-static` module allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash `//` followed by a domain: `http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e`.

A DOS vulnerability is possible if the URL contains invalid characters `curl --path-as-is "http://localhost:3000//^/.."`

The issue shows up on all the `fastify-static` applications that set `redirect: true` option. By default, it is `false`.

### Patches The issue has been patched in `fastify-static@4.4.1`

### Workarounds If updating is not an option, you can sanitize the input URLs using the [`rewriteUrl`](https://www.fastify.io/docs/latest/Server/#rewriteurl) server option.

### References

+ Bug founder: drstrnegth + [hackerone Report](https://hackerone.com/reports/1361804)