---
id: CVE-2026-47673
title: >-
  Hono is a Web application framework that provides support for any JavaScript
  runtime
summary: >-
  Hono is a Web application framework that provides support for any JavaScript
  runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify that the
  Authorization header value uses theBearer scheme. Any two-part header value —
  rega…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-285
vendor: hono
product: hono
affected:
  - hono < 4.12.21
patched:
  - hono 4.12.21
published: '2026-05-28'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47673'
references:
  - url: 'https://github.com/honojs/hono/security/advisories/GHSA-f577-qrjj-4474'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00253
epssPercentile: 0.15573
ingestedAt: '2026-10-14T20:53:12.340Z'
---

## Overview

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify that the Authorization header value uses theBearer scheme. Any two-part header value — regardless of the scheme name in the first position — proceeds to JWT verification. A request presenting a valid JWT under a non-Bearer scheme identifier (such as Basic or Token) is authenticated identically to a correctly formed Bearer request. This vulnerability is fixed in 4.12.21.

## Affected

- `hono < 4.12.21`

## Remediation

Upgrade past the affected range:

- `hono 4.12.21`