Vulnerability-Lookup

CVE-2026-39406 (GCVE-0-2026-39406)

Vulnerability from cvelistv5 – Published: 2026-04-08 14:34 – Updated: 2026-04-08 15:17

Title

@hono/node-server has a middleware bypass via repeated slashes in serveStatic

Summary

@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.13, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 1.19.13.

Severity ?

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

URL

Tags

https://github.com/honojs/node-server/security/ad…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	honojs	node-server	Affected: < 1.19.13

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-39406

Vulnerability from fkie_nvd - Published: 2026-04-08 15:16 - Updated: 2026-04-08 21:26

Severity ?

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/honojs/node-server/security/advisories/GHSA-92pp-h63x-v22m

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "lang": "en",
      "value": "@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.13, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 1.19.13."
    }
  ],
  "id": "CVE-2026-39406",
  "lastModified": "2026-04-08T21:26:13.410",
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}

GHSA-92PP-H63X-V22M

Vulnerability from github – Published: 2026-04-08 00:16 – Updated: 2026-04-08 15:34

Summary

@hono/node-server: Middleware bypass via repeated slashes in serveStatic

Details

Summary

A path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path.

When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass.

Details

The routing layer and serveStatic handle repeated slashes differently.

For example:

/admin/secret.txt => matches /admin/*
//admin/secret.txt => may not match /admin/*

This inconsistency allows a request such as:

GET //admin/secret.txt

to bypass middleware registered on /admin/* and access protected files.

Impact

An attacker can access static files that are intended to be protected by route-based middleware by using repeated slashes in the request path.

This can lead to unauthorized access to sensitive files under the static root.

This issue affects applications that rely on serveStatic together with route-based middleware for access control.

Severity ?

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@hono/node-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39406"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T00:16:39Z",
    "nvd_published_at": "2026-04-08T15:16:14Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nA path handling inconsistency in `serveStatic` allows protected static files to be accessed by using repeated slashes (`//`) in the request path.\n\nWhen route-based middleware (e.g., `/admin/*`) is used for authorization, the router may not match paths containing repeated slashes, while `serveStatic` resolves them as normalized paths. This can lead to a middleware bypass.\n\n## Details\n\nThe routing layer and `serveStatic` handle repeated slashes differently.\n\nFor example:\n\n- `/admin/secret.txt` =\u003e matches `/admin/*`\n- `//admin/secret.txt` =\u003e may not match `/admin/*`\n\nThis inconsistency allows a request such as:\n\n```\nGET //admin/secret.txt\n```\n\nto bypass middleware registered on `/admin/*` and access protected files.\n\n## Impact\n\nAn attacker can access static files that are intended to be protected by route-based middleware by using repeated slashes in the request path.\n\nThis can lead to unauthorized access to sensitive files under the static root.\n\nThis issue affects applications that rely on `serveStatic` together with route-based middleware for access control.",
  "id": "GHSA-92pp-h63x-v22m",
  "modified": "2026-04-08T15:34:25Z",
  "published": "2026-04-08T00:16:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/node-server/security/advisories/GHSA-92pp-h63x-v22m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39406"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/node-server/commit/025c30f55d589ddbe6048b151d77e904f67a8cc2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/node-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/node-server/releases/tag/v1.19.13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@hono/node-server: Middleware bypass via repeated slashes in serveStatic"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-39406 (GCVE-0-2026-39406)

FKIE_CVE-2026-39406

GHSA-92PP-H63X-V22M

Summary

Details

Impact

Tags

Sightings

Nomenclature