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              "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"
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