Vulnerability-Lookup

GHSA-5R4P-P66F-JHC7

Vulnerability from github – Published: 2026-10-20 14:36 – Updated: 2026-10-20 14:36

Summary

Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths

Details

Summary

serveStatic decodes the request path a second time after Hono has already decoded it for routing. A crafted request can be routed as one path and served as another, so middleware mounted on a static prefix does not run for a file under that prefix.

Details

Hono decodes the request path once before routing. serveStatic decoded it again before resolving the file. With a malformed percent-encoded sequence, the first decode leaves part of the path encoded, the router matches the encoded form, and the second decode resolves the real directory. The file is still resolved inside the configured root; this is not a traversal outside it.

Impact

An unauthenticated attacker may reach static files without the middleware on their prefix running, for example an authentication check. This affects applications that mount middleware on part of the directory served by serveStatic. Applications that serve only public files are not affected.

Severity

5.3 (Medium)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "hono"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.12.4"
            },
            {
              "fixed": "4.13.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-111757"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-174"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-20T14:36:11Z",
    "nvd_published_at": "2026-10-19T18:17:00Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\n`serveStatic` decodes the request path a second time after Hono has already decoded it for routing. A crafted request can be routed as one path and served as another, so middleware mounted on a static prefix does not run for a file under that prefix.\n\n### Details\n\nHono decodes the request path once before routing. `serveStatic` decoded it again before resolving the file. With a malformed percent-encoded sequence, the first decode leaves part of the path encoded, the router matches the encoded form, and the second decode resolves the real directory. The file is still resolved inside the configured root; this is not a traversal outside it.\n\n### Impact\n\nAn unauthenticated attacker may reach static files without the middleware on their prefix running, for example an authentication check. This affects applications that mount middleware on part of the directory served by `serveStatic`. Applications that serve only public files are not affected.",
  "id": "GHSA-5r4p-p66f-jhc7",
  "modified": "2026-10-20T14:36:11Z",
  "published": "2026-10-20T14:36:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111757"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/commit/8b05c774ef1555c70f5ba5e2991b7e77cc3635cc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/hono"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/releases/tag/v4.13.11"
    }
  ],
  "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: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths"
}

CVE-2026-111757 (GCVE-0-2026-111757)

Vulnerability from cvelistv5 – Published: 2026-10-19 17:31 – Updated: 2026-10-20 16:10

Title

Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths

Summary

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-20 15:18 UTC

CWE

CWE-174 - Double Decoding of the Same Data

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7737 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/honojs/hono/security/advisorie…	x_refsource_CONFIRM
https://github.com/honojs/hono/commit/8b05c774ef1…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
honojs	hono	Affected: >= 4.12.4, < 4.13.11

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-111757",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-20T15:18:52.675084Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-20T16:10:30.638Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "hono",
          "vendor": "honojs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.12.4, \u003c 4.13.11"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-174",
              "description": "CWE-174: Double Decoding of the Same Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T17:31:20.341Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7"
        },
        {
          "name": "https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7"
        },
        {
          "name": "https://github.com/honojs/hono/commit/8b05c774ef1555c70f5ba5e2991b7e77cc3635cc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/honojs/hono/commit/8b05c774ef1555c70f5ba5e2991b7e77cc3635cc"
        }
      ],
      "source": {
        "advisory": "GHSA-5r4p-p66f-jhc7",
        "discovery": "UNKNOWN"
      },
      "title": "Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-111757",
    "datePublished": "2026-10-19T17:31:20.341Z",
    "dateReserved": "2026-10-16T17:52:09.081Z",
    "dateUpdated": "2026-10-20T16:10:30.638Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-5R4P-P66F-JHC7

Summary

Details

Impact

CVE-2026-111757 (GCVE-0-2026-111757)

Tags

Sightings

Nomenclature

Vulnerability timeline

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