GHSA-9hp6-4448-45g2
Hono's flaw in URL path parsing could cause path confusion
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### Summary
A flaw in the `getPath` utility function could allow path confusion and potential bypass of proxy-level ACLs (e.g. Nginx location blocks).
### Details
The original implementation relied on fixed character offsets when parsing request URLs. Under certain malformed absolute-form Request-URIs, this could lead to incorrect path extraction.
Most standards-compliant runtimes and reverse proxies reject such malformed requests with a 400 Bad Request, so the impact depends on the application and environment.
### Impact
If proxy ACLs are used to protect sensitive endpoints such as `/admin`, this flaw could have allowed unauthorized access. The confidentiality impact depends on what data is exposed: if sensitive administrative data is exposed, the impact may be High (CVSS 7.5); otherwise it may be Medium (CVSS 5.3).
### Resolution
The implementation has been updated to correctly locate the first slash after "://", preventing such path confusion.
References
External links from the advisory. They lead to third-party sites.