Web Application Framework Vulnerability in Hono by Honojs
CVE-2026-126358

5.3MEDIUM

Key Information:

Vendor

Honojs

Status
Hono
Vendor
CVE Published:
12 November 2026

What is CVE-2026-126358?

A vulnerability in the Hono web application framework allows unauthenticated clients to bypass specified authentication or authorization middleware on certain routes. The issue arises in RegExpRouter under specific conditions, where wildcard middleware fails to bind correctly to certain route patterns. For versions 4.1.4 to 4.13.16, critical route handling cases—including requests with encoded line terminators—do not properly enforce middleware checks, resulting in potential exposure of protected resources. The problem is rectified in version 4.13.16.

Affected Version(s)

hono >= 4.1.4, < 4.13.16

References

https://github.com/honojs/hono/security/advisories/GHSA-h...
x_refsource_CONFIRM
https://github.com/honojs/hono/commit/8a103aa59bcfbffd539...
x_refsource_MISC
https://github.com/honojs/hono/releases/tag/v4.13.16
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.