Vulnerability-Lookup

CVE-2026-54288 (GCVE-0-2026-54288)

Vulnerability from cvelistv5 – Published: 2026-06-22 17:18 – Updated: 2026-06-23 16:11

Title

Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`

Summary

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, the Body Limit Middleware trusts the request's Content-Length header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit. This vulnerability is fixed in 4.12.25.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/honojs/hono/security/advisorie…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
honojs	hono	Affected: < 4.12.25

Show details on NVD website

JSON

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GHSA-RV63-4MWF-QQC2

Vulnerability from github – Published: 2026-06-16 14:32 – Updated: 2026-06-16 14:32

Summary

hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`

Details

Summary

The Body Limit Middleware trusts the request's Content-Length header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit.

Details

When Content-Length is present and Transfer-Encoding is absent, the middleware compares the declared value against the limit and passes the request through if it is small enough. On standards-based runtimes the transport enforces that Content-Length matches the body, so this is safe. The Lambda adapters instead reconstruct the request from a buffered payload and copy the client's Content-Length verbatim, so the declared length and the real body size are decoupled.

This issue affects applications deployed on AWS Lambda that rely on the Body Limit Middleware to cap request body size.

Impact

The declared body-size limit can be bypassed: a handler reads a payload larger than the configured maximum. Processing the oversized payload (large JSON, multipart, etc.) consumes additional CPU and memory per request. The payload remains bounded by the platform's request size limits, and Lambda isolates invocations, so the impact is increased per-request resource usage rather than full denial of service. This affects applications deployed on AWS Lambda that use the Body Limit Middleware.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "hono"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.12.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54288"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-16T14:32:49Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe Body Limit Middleware trusts the request\u0027s `Content-Length` header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared `Content-Length`, which need not match the actual payload. A client can declare a tiny `Content-Length` while sending a much larger body, slipping past the limit.\n\n### Details\n\nWhen `Content-Length` is present and `Transfer-Encoding` is absent, the middleware compares the declared value against the limit and passes the request through if it is small enough. On standards-based runtimes the transport enforces that `Content-Length` matches the body, so this is safe. The Lambda adapters instead reconstruct the request from a buffered payload and copy the client\u0027s `Content-Length` verbatim, so the declared length and the real body size are decoupled.\n\nThis issue affects applications deployed on AWS Lambda that rely on the Body Limit Middleware to cap request body size.\n\n### Impact\n\nThe declared body-size limit can be bypassed: a handler reads a payload larger than the configured maximum. Processing the oversized payload (large JSON, multipart, etc.) consumes additional CPU and memory per request. The payload remains bounded by the platform\u0027s request size limits, and Lambda isolates invocations, so the impact is increased per-request resource usage rather than full denial of service. This affects applications deployed on AWS Lambda that use the Body Limit Middleware.",
  "id": "GHSA-rv63-4mwf-qqc2",
  "modified": "2026-06-16T14:32:49Z",
  "published": "2026-06-16T14:32:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/hono"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`"
}

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.

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CVE-2026-54288 (GCVE-0-2026-54288)

GHSA-RV63-4MWF-QQC2

Summary

Details

Impact

Tags

Sightings

Nomenclature