CVE-2025-58362: 
JavaScript vulnerability analysis and mitigation

A high severity vulnerability (CVE-2025-58362) was discovered in Hono's URL path parsing functionality affecting versions 4.8.0 through 4.9.6. The vulnerability was disclosed on September 3, 2025, impacting the npm package 'hono'. The flaw exists in the getPath utility function which could lead to path confusion and potential bypass of proxy-level Access Control Lists (ACLs) (GitHub Advisory).

The vulnerability stems from the original implementation's reliance on fixed character offsets when parsing request URLs. Under certain malformed absolute-form Request-URIs, this could lead to incorrect path extraction. The vulnerability has been assigned a CVSS score of 7.5 (High), with attack vector being Network, attack complexity Low, requiring no privileges or user interaction (GitHub Advisory).

If proxy ACLs are used to protect sensitive endpoints such as /admin, this vulnerability could allow unauthorized access to restricted areas. The confidentiality impact varies depending on the exposed data - if sensitive administrative data is exposed, the impact is considered High (CVSS 7.5); otherwise, it may be Medium (CVSS 5.3) (GitHub Advisory).

The vulnerability has been patched in version 4.9.6 of the Hono package. The fix updates the implementation to correctly locate the first slash after '://', preventing path confusion. Users are strongly advised to upgrade to version 4.9.6 or later, especially if they rely on reverse proxies (e.g., Nginx) for ACLs or restrict access to endpoints (Hono Release).

The release of version 4.9.6 received positive community engagement, with multiple developers acknowledging the security fix. The GitHub release announcement garnered multiple reactions including thumbs up, heart, and rocket emojis from the community, indicating strong support for the security patch (Hono Release).