{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-15284",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-30T14:55:26.031863Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-30T15:57:41.402Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://npmjs.com/qs",
          "defaultStatus": "affected",
          "modules": [
            "parse"
          ],
          "packageName": "qs",
          "repo": "https://github.com/ljharb/qs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.14.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.\u003cp\u003eThis issue affects qs: \u0026lt; 6.14.1.\u003c/p\u003e\u003ch3\u003e\u003cbr\u003eSummary\u003c/h3\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eThe \u003ccode\u003earrayLimit\u003c/code\u003e\u0026nbsp;option in qs did not enforce limits for bracket notation (\u003ccode\u003ea[]=1\u0026amp;a[]=2\u003c/code\u003e), only for indexed notation (\u003ccode\u003ea[0]=1\u003c/code\u003e). This is a consistency bug; \u003ccode\u003earrayLimit\u003c/code\u003e\u0026nbsp;should apply uniformly across all array notations.\u003c/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c/strong\u003e\u0026nbsp;The default \u003ccode\u003eparameterLimit\u003c/code\u003e\u0026nbsp;of 1000 effectively mitigates the DoS scenario originally described. With default options, bracket notation cannot produce arrays larger than \u003ccode\u003eparameterLimit\u003c/code\u003e\u0026nbsp;regardless of \u003ccode\u003earrayLimit\u003c/code\u003e, because each \u003ccode\u003ea[]=value\u003c/code\u003econsumes one parameter slot. The severity has been reduced accordingly.\u003c/p\u003e\u003ch3\u003eDetails\u003c/h3\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eThe \u003ccode\u003earrayLimit\u003c/code\u003e\u0026nbsp;option only checked limits for indexed notation (\u003ccode\u003ea[0]=1\u0026amp;a[1]=2\u003c/code\u003e) but did not enforce it for bracket notation (\u003ccode\u003ea[]=1\u0026amp;a[]=2\u003c/code\u003e).\u003c/p\u003e\u003cp\u003e\u003cstrong\u003eVulnerable code\u003c/strong\u003e\u0026nbsp;(\u003ccode\u003elib/parse.js:159-162\u003c/code\u003e):\u003c/p\u003e\u003cdiv\u003e\u003cpre\u003eif (root === \u0027[]\u0027 \u0026amp;\u0026amp; options.parseArrays) {\n    obj = utils.combine([], leaf);  // No arrayLimit check\n}\u003c/pre\u003e\u003cdiv\u003e\u003c/div\u003e\u003c/div\u003e\u003cp\u003e\u003cstrong\u003eWorking code\u003c/strong\u003e\u0026nbsp;(\u003ccode\u003elib/parse.js:175\u003c/code\u003e):\u003c/p\u003e\u003cdiv\u003e\u003cpre\u003eelse if (index \u0026lt;= options.arrayLimit) {  // Limit checked here\n    obj = [];\n    obj[index] = leaf;\n}\u003c/pre\u003e\u003cdiv\u003e\u003c/div\u003e\u003c/div\u003e\u003cp\u003eThe bracket notation handler at line 159 uses \u003ccode\u003eutils.combine([], leaf)\u003c/code\u003e\u0026nbsp;without validating against \u003ccode\u003eoptions.arrayLimit\u003c/code\u003e, while indexed notation at line 175 checks \u003ccode\u003eindex \u0026lt;= options.arrayLimit\u003c/code\u003e\u0026nbsp;before creating arrays.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003ch3\u003ePoC\u003c/h3\u003e\u003cp\u003e\u003cstrong\u003e\u003c/strong\u003e\u003c/p\u003e\u003cdiv\u003e\u003cpre\u003econst qs = require(\u0027qs\u0027);\nconst result = qs.parse(\u0027a[]=1\u0026amp;a[]=2\u0026amp;a[]=3\u0026amp;a[]=4\u0026amp;a[]=5\u0026amp;a[]=6\u0027, { arrayLimit: 5 });\nconsole.log(result.a.length);  // Output: 6 (should be max 5)\u003c/pre\u003e\u003cdiv\u003e\u003c/div\u003e\u003c/div\u003e\u003cp\u003e\u003cstrong\u003eNote on parameterLimit interaction:\u003c/strong\u003e\u0026nbsp;The original advisory\u0027s \"DoS demonstration\" claimed a length of 10,000, but \u003ccode\u003eparameterLimit\u003c/code\u003e\u0026nbsp;(default: 1000) caps parsing to 1,000 parameters. With default options, the actual output is 1,000, not 10,000.\u003c/p\u003e\u003ch3\u003eImpact\u003c/h3\u003e\u003cp\u003e\u003c/p\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eConsistency bug in \u003c/span\u003e\u003ccode\u003earrayLimit\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;enforcement. With default \u003c/span\u003e\u003ccode\u003eparameterLimit\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e, the practical DoS risk is negligible since \u003c/span\u003e\u003ccode\u003eparameterLimit\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;already caps the total number of parsed parameters (and thus array elements from bracket notation). The risk increases only when \u003c/span\u003e\u003ccode\u003eparameterLimit\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;is explicitly set to a very high value.\u003c/span\u003e"
            }
          ],
          "value": "Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.This issue affects qs: \u003c 6.14.1.\n\n\nSummary\n\nThe arrayLimit\u00a0option in qs did not enforce limits for bracket notation (a[]=1\u0026a[]=2), only for indexed notation (a[0]=1). This is a consistency bug; arrayLimit\u00a0should apply uniformly across all array notations.\n\nNote:\u00a0The default parameterLimit\u00a0of 1000 effectively mitigates the DoS scenario originally described. With default options, bracket notation cannot produce arrays larger than parameterLimit\u00a0regardless of arrayLimit, because each a[]=valueconsumes one parameter slot. The severity has been reduced accordingly.\n\nDetails\n\nThe arrayLimit\u00a0option only checked limits for indexed notation (a[0]=1\u0026a[1]=2) but did not enforce it for bracket notation (a[]=1\u0026a[]=2).\n\nVulnerable code\u00a0(lib/parse.js:159-162):\n\nif (root === \u0027[]\u0027 \u0026\u0026 options.parseArrays) {\n    obj = utils.combine([], leaf);  // No arrayLimit check\n}\n\n\n\n\n\nWorking code\u00a0(lib/parse.js:175):\n\nelse if (index \u003c= options.arrayLimit) {  // Limit checked here\n    obj = [];\n    obj[index] = leaf;\n}\n\n\n\n\n\nThe bracket notation handler at line 159 uses utils.combine([], leaf)\u00a0without validating against options.arrayLimit, while indexed notation at line 175 checks index \u003c= options.arrayLimit\u00a0before creating arrays.\n\n\n\nPoC\n\nconst qs = require(\u0027qs\u0027);\nconst result = qs.parse(\u0027a[]=1\u0026a[]=2\u0026a[]=3\u0026a[]=4\u0026a[]=5\u0026a[]=6\u0027, { arrayLimit: 5 });\nconsole.log(result.a.length);  // Output: 6 (should be max 5)\n\n\n\n\n\nNote on parameterLimit interaction:\u00a0The original advisory\u0027s \"DoS demonstration\" claimed a length of 10,000, but parameterLimit\u00a0(default: 1000) caps parsing to 1,000 parameters. With default options, the actual output is 1,000, not 10,000.\n\nImpact\n\nConsistency bug in arrayLimit\u00a0enforcement. With default parameterLimit, the practical DoS risk is negligible since parameterLimit\u00a0already caps the total number of parsed parameters (and thus array elements from bracket notation). The risk increases only when parameterLimit\u00a0is explicitly set to a very high value."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-469",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-469 HTTP DoS"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-10T20:06:42.111Z",
        "orgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
        "shortName": "harborist"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/ljharb/qs/security/advisories/GHSA-6rw7-vpxm-498p"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/ljharb/qs/commit/3086902ecf7f088d0d1803887643ac6c03d415b9"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "arrayLimit bypass in bracket notation allows DoS via memory exhaustion",
      "x_generator": {
        "engine": "Vulnogram 0.5.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
    "assignerShortName": "harborist",
    "cveId": "CVE-2025-15284",
    "datePublished": "2025-12-29T22:56:45.240Z",
    "dateReserved": "2025-12-29T21:36:51.399Z",
    "dateUpdated": "2026-02-10T20:06:42.111Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}