# CVE-2026-126358: Hono: RegExpRouter skips wildcard middleware for some route sets and for paths with an encoded line terminator

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.1.4 until 4.13.16, RegExpRouter can omit wildcard middleware in three version-specific cases: since 4.13.0, middleware using the explicit default parameter pattern in /api/:tenant{[^/]+}/admin/* is not applied to a route written as /api/:tenant/admin/:id; since 4.1.4, middleware on /admin/* is not applied to a route registered as /admin* for paths under /admin/; and since 4.4.0, a request path containing an encoded line terminator can reach the not-found handler without wildcard middleware. The default SmartRouter selects RegExpRouter for most applications, and the router's registration-time coverage calculation treated the first two matching pattern pairs as different while its compiled wildcard did not match line terminators in the third case. An unauthenticated client can reach a route handler or the not-found handler without authentication or authorization middleware registered on the wildcard path. TrieRouter, LinearRouter, and PatternRouter apply the middleware in the three described cases. This issue is fixed in version 4.13.16.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- honojs / hono: >= 4.1.4, < 4.13.16 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-863

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/honojs/hono/security/advisories/GHSA-h7mg-cq63-vhpq (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/honojs/hono/commit/8a103aa59bcfbffd5396b1548a0dff3688777c36 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/honojs/hono/releases/tag/v4.13.16 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-126358; retrieved 2026-11-12; source updated 2026-11-12

Revision: 03c649ca2f35e864604d3438797046680729cf266a17c4497caf244970c90dcc

Canonical: https://y2.dev/cve/CVE-2026-126358

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