Vulnerability-Lookup

CVE-2026-84364 (GCVE-0-2026-84364)

Vulnerability from cvelistv5 – Published: 2026-09-01 20:24 – Updated: 2026-09-02 15:45

Title

Hono: Unbounded dot-notation nesting in `parseBody()` can cause memory exhaustion

Summary

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.5, when parseBody() expands dot-separated form field names into nested objects with dot-notation parsing enabled, it does not limit the nesting depth or the total number of intermediate objects created. Empty segments are preserved, so one deeply dotted field name can encode one nesting level per byte, while a large number of shallowly dotted fields can create the same amplification across a request. A request body within a normal size limit can therefore allocate an object graph far larger than the request after the body has already been accepted. An unauthenticated attacker who can reach an affected endpoint can send concurrent requests that exhaust the JavaScript heap, terminate the server process, and leave the service unavailable until restart. Dot-notation parsing is not enabled by default, and applications using the default behavior are not affected. This issue is fixed in version 4.13.5.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 15:45 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/honojs/hono/security/advisorie…	x_refsource_CONFIRM
https://github.com/honojs/hono/commit/531e9c5a3ae…	x_refsource_MISC
https://github.com/honojs/hono/releases/tag/v4.13.5	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
honojs	hono	Affected: < 4.13.5	guessed

Show details on NVD website

JSON

To clipboard

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        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-84364",
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                  },
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        }
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      },
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          ],
          "url": "https://github.com/honojs/hono/security/advisories/GHSA-g6gw-c38x-mqfc"
        },
        {
          "name": "https://github.com/honojs/hono/commit/531e9c5a3ae058d10de33f643055bd4009a87178",
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FKIE_CVE-2026-84364

Vulnerability from fkie_nvd - Published: 2026-09-01 21:18 - Updated: 2026-09-02 16:17

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/honojs/hono/commit/531e9c5a3ae058d10de33f643055bd4009a87178
	security-advisories@github.com	https://github.com/honojs/hono/releases/tag/v4.13.5
	security-advisories@github.com	https://github.com/honojs/hono/security/advisories/GHSA-g6gw-c38x-mqfc

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "hono",
          "vendor": "honojs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.13.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.5, when parseBody() expands dot-separated form field names into nested objects with dot-notation parsing enabled, it does not limit the nesting depth or the total number of intermediate objects created. Empty segments are preserved, so one deeply dotted field name can encode one nesting level per byte, while a large number of shallowly dotted fields can create the same amplification across a request. A request body within a normal size limit can therefore allocate an object graph far larger than the request after the body has already been accepted. An unauthenticated attacker who can reach an affected endpoint can send concurrent requests that exhaust the JavaScript heap, terminate the server process, and leave the service unavailable until restart. Dot-notation parsing is not enabled by default, and applications using the default behavior are not affected. This issue is fixed in version 4.13.5."
    }
  ],
  "id": "CVE-2026-84364",
  "lastModified": "2026-09-02T16:17:28.370",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
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            },
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          "version": "2.0.3"
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  "published": "2026-09-01T21:18:47.317",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/honojs/hono/commit/531e9c5a3ae058d10de33f643055bd4009a87178"
    },
    {
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    },
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      "type": "Secondary"
    }
  ]
}

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.
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.

Action not permitted

CVE-2026-84364 (GCVE-0-2026-84364)

FKIE_CVE-2026-84364

Tags

Sightings

Nomenclature