fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Nodes URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.
Weakness
Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B’s state.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Fast-uri | Openjsf | 2.3.1 (including) | 3.1.3 (excluding) |
| Fast-uri | Openjsf | 4.0.0 (including) | 4.0.1 (excluding) |
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/105.html
- https://cwe.mitre.org/data/definitions/273.html
- https://cwe.mitre.org/data/definitions/34.html
References
- https://cna.openjsf.org/security-advisories.html
- https://github.com/fastify/fast-uri/security/advisories/GHSA-4c8g-83qw-93j6
- https://access.redhat.com/security/cve/CVE-2026-13676
- https://bugzilla.redhat.com/show_bug.cgi?id=2494197
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13676.json