Description
fast-uri decodes a hostname’s percent escapes twice in a single normalize() or resolve() call: once during parsing and again during authority recomposition.
Recommendation
Update the fast-uri package to the latest compatible version. Followings are version details:
Affected version(s): **>= 4.0.0, < 4.1.3 >= 3.1.2, < 3.1.6 >= 2.4.1, < 2.4.5** Patched version(s): **4.1.3 3.1.6 2.4.5**
References
Could your website be exposed too?
SmartScanner can check your website for fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding and gives you actionable findings to investigate.
Start a free scanRelated Issues
- fast-uri vulnerable to server-side request forgery via malformed IPv6 normalization - CVE-2026-75975
- fast-uri vulnerable to URI scheme spoofing via percent-encoded scheme decoding - CVE-2026-110306
- fast-uri vulnerable to path traversal via percent-encoded dot segments - CVE-2026-6321
- fast-uri vulnerable to host confusion via percent-encoded authority delimiters - CVE-2026-6322
You might also like:
See something that needs correcting? Let us knowUpdated September 02, 2026