Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte characters, resulting in the mounted sub-application receiving an incorrect path. This vulnerability is fixed in 4.12.21.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21,
    app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route
    matching is performed against the percent-decoded path. This inconsistency causes the prefix to be
    stripped at the wrong position when the path contains percent-encoded multi-byte characters, resulting in
    the mounted sub-application receiving an incorrect path. This vulnerability is fixed in 4.12.21.
    (CVE-2026-47676)

ID	Name	Product	Family	Type	Severity
460076	Echo: hono: security update to 4.12.21	Tenable Cloud Security	Echo Local Security Checks	Local	medium
460076	Echo: hono: security update to 4.12.21	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
442621	SCA: security update for hono (GHSA-2gcr-mfcq-wcc3)	Tenable Cloud Security	SCA Checks	Local	medium
442621	SCA: security update for hono (GHSA-2gcr-mfcq-wcc3)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-47676

medium

Tenable Plugins

medium

medium

medium

medium