GHSA-9hp6-4448-45g2

ghsaUSosv

Hono's flaw in URL path parsing could cause path confusion

view advisory published 2025-09-03Licence: CC-BY-4.0

### 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.

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describes (1)

Related CVEs.

IDseverity exploitable
CVE-2025-58362US——
Hono is a Web application framework that provides support for any JavaScript runtime. Versions 4.8.0 through 4.9.5 contain a flaw in the getPath utility function which could allow…
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