Vulnerability-Lookup

GHSA-XGM2-5F3F-MVVC

Vulnerability from github – Published: 2026-07-21 18:18 – Updated: 2026-07-21 18:18

Summary

Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication

Details

Summary

The AWS API Gateway v1 adapter can drop a distinct repeated request header value. When a header appears multiple times, the adapter de-duplicates values using a substring comparison instead of an exact match, so a value that is a substring of another value of the same header is omitted (for example, 203.0.113.1 is dropped when another value is 203.0.113.10).

Details

A repeated request header carries an ordered list of values. Middleware or application logic that depends on the complete list — such as IP restriction that walks the X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation — can therefore receive incomplete data that differs from what the client actually sent.

This issue arises on deployments using the AWS API Gateway v1 adapter (the same pattern also affects the VPC Lattice adapter), for requests that contain the same header more than once.

Impact

An attacker can craft repeated header values so that one value is omitted before the application sees the request. Where a security or routing decision relies on the full chain, this can alter that decision.

This affects applications deployed through Hono's AWS API Gateway v1 (or VPC Lattice) adapter that rely on the complete set of repeated request header values.

Severity

4.8 (Medium)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "hono"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.3"
            },
            {
              "fixed": "4.12.27"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59897"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-348"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T18:18:13Z",
    "nvd_published_at": "2026-07-08T17:17:27Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe AWS API Gateway v1 adapter can drop a distinct repeated request header value. When a header appears multiple times, the adapter de-duplicates values using a substring comparison instead of an exact match, so a value that is a substring of another value of the same header is omitted (for example, `203.0.113.1` is dropped when another value is `203.0.113.10`).\n\n### Details\n\nA repeated request header carries an ordered list of values. Middleware or application logic that depends on the complete list \u2014 such as IP restriction that walks the `X-Forwarded-For` chain, rate limiting, audit logging, or proxy-chain validation \u2014 can therefore receive incomplete data that differs from what the client actually sent.\n\nThis issue arises on deployments using the AWS API Gateway v1 adapter (the same pattern also affects the VPC Lattice adapter), for requests that contain the same header more than once.\n\n### Impact\n\nAn attacker can craft repeated header values so that one value is omitted before the application sees the request. Where a security or routing decision relies on the full chain, this can alter that decision.\n\nThis affects applications deployed through Hono\u0027s AWS API Gateway v1 (or VPC Lattice) adapter that rely on the complete set of repeated request header values.",
  "id": "GHSA-xgm2-5f3f-mvvc",
  "modified": "2026-07-21T18:18:13Z",
  "published": "2026-07-21T18:18:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59897"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/hono"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/releases/tag/v4.12.27"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication"
}

CVE-2026-59897 (GCVE-0-2026-59897)

Vulnerability from cvelistv5 – Published: 2026-07-08 16:06 – Updated: 2026-07-09 13:51

Title

Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication

Summary

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27.

Severity

4.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-348 - Use of Less Trusted Source

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/honojs/hono/security/advisorie…	x_refsource_CONFIRM
https://github.com/honojs/hono/commit/aa921770d09…	x_refsource_MISC
https://github.com/honojs/hono/releases/tag/v4.12.27	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
honojs	hono	Affected: >= 4.3.3, < 4.12.27

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-59897",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T13:51:23.283182Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-09T13:51:31.335Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "hono",
          "vendor": "honojs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.3.3, \u003c 4.12.27"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-348",
              "description": "CWE-348: Use of Less Trusted Source",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T16:06:11.369Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc"
        },
        {
          "name": "https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd"
        },
        {
          "name": "https://github.com/honojs/hono/releases/tag/v4.12.27",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/honojs/hono/releases/tag/v4.12.27"
        }
      ],
      "source": {
        "advisory": "GHSA-xgm2-5f3f-mvvc",
        "discovery": "UNKNOWN"
      },
      "title": "Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-59897",
    "datePublished": "2026-07-08T16:06:11.369Z",
    "dateReserved": "2026-07-07T16:40:07.984Z",
    "dateUpdated": "2026-07-09T13:51:31.335Z",
    "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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-XGM2-5F3F-MVVC

Summary

Details

Impact

CVE-2026-59897 (GCVE-0-2026-59897)

Tags

Sightings

Nomenclature