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GET /api/packages/64159?format=api
{ "url": "http://public2.vulnerablecode.io/api/packages/64159?format=api", "purl": "pkg:npm/qs@6.14.2", "type": "npm", "namespace": "", "name": "qs", "version": "6.14.2", "qualifiers": {}, "subpath": "", "is_vulnerable": false, "next_non_vulnerable_version": null, "latest_non_vulnerable_version": null, "affected_by_vulnerabilities": [], "fixing_vulnerabilities": [ { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/21713?format=api", "vulnerability_id": "VCID-pxq3-b7gn-3yah", "summary": "qs's arrayLimit bypass in comma parsing allows denial of service\n### Summary\nThe `arrayLimit` option in qs does not enforce limits for comma-separated values when `comma: true` is enabled, allowing attackers to cause denial-of-service via memory exhaustion. This is a bypass of the array limit enforcement, similar to the bracket notation bypass addressed in GHSA-6rw7-vpxm-498p (CVE-2025-15284).\n\n### Details\nWhen the `comma` option is set to `true` (not the default, but configurable in applications), qs allows parsing comma-separated strings as arrays (e.g., `?param=a,b,c` becomes `['a', 'b', 'c']`). However, the limit check for `arrayLimit` (default: 20) and the optional throwOnLimitExceeded occur after the comma-handling logic in `parseArrayValue`, enabling a bypass. This permits creation of arbitrarily large arrays from a single parameter, leading to excessive memory allocation.\n\n**Vulnerable code** (lib/parse.js: lines ~40-50):\n```js\nif (val && typeof val === 'string' && options.comma && val.indexOf(',') > -1) {\n return val.split(',');\n}\n\nif (options.throwOnLimitExceeded && currentArrayLength >= options.arrayLimit) {\n throw new RangeError('Array limit exceeded. Only ' + options.arrayLimit + ' element' + (options.arrayLimit === 1 ? '' : 's') + ' allowed in an array.');\n}\n\nreturn val;\n```\nThe `split(',')` returns the array immediately, skipping the subsequent limit check. Downstream merging via `utils.combine` does not prevent allocation, even if it marks overflows for sparse arrays.This discrepancy allows attackers to send a single parameter with millions of commas (e.g., `?param=,,,,,,,,...`), allocating massive arrays in memory without triggering limits. It bypasses the intent of `arrayLimit`, which is enforced correctly for indexed (`a[0]=`) and bracket (`a[]=`) notations (the latter fixed in v6.14.1 per GHSA-6rw7-vpxm-498p).\n\n### PoC\n**Test 1 - Basic bypass:**\n```\nnpm install qs\n```\n\n```js\nconst qs = require('qs');\n\nconst payload = 'a=' + ','.repeat(25); // 26 elements after split (bypasses arrayLimit: 5)\nconst options = { comma: true, arrayLimit: 5, throwOnLimitExceeded: true };\n\ntry {\n const result = qs.parse(payload, options);\n console.log(result.a.length); // Outputs: 26 (bypass successful)\n} catch (e) {\n console.log('Limit enforced:', e.message); // Not thrown\n}\n```\n**Configuration:**\n- `comma: true`\n- `arrayLimit: 5`\n- `throwOnLimitExceeded: true`\n\nExpected: Throws \"Array limit exceeded\" error.\nActual: Parses successfully, creating an array of length 26.\n\n\n### Impact\nDenial of Service (DoS) via memory exhaustion.\n\n### Suggested Fix\nMove the `arrayLimit` check before the comma split in `parseArrayValue`, and enforce it on the resulting array length. Use `currentArrayLength` (already calculated upstream) for consistency with bracket notation fixes.\n\n**Current code** (lib/parse.js: lines ~40-50):\n```js\nif (val && typeof val === 'string' && options.comma && val.indexOf(',') > -1) {\n return val.split(',');\n}\n\nif (options.throwOnLimitExceeded && currentArrayLength >= options.arrayLimit) {\n throw new RangeError('Array limit exceeded. Only ' + options.arrayLimit + ' element' + (options.arrayLimit === 1 ? '' : 's') + ' allowed in an array.');\n}\n\nreturn val;\n```\n\n**Fixed code:**\n```js\nif (val && typeof val === 'string' && options.comma && val.indexOf(',') > -1) {\n const splitArray = val.split(',');\n if (splitArray.length > options.arrayLimit - currentArrayLength) { // Check against remaining limit\n if (options.throwOnLimitExceeded) {\n throw new RangeError('Array limit exceeded. Only ' + options.arrayLimit + ' element' + (options.arrayLimit === 1 ? '' : 's') + ' allowed in an array.');\n } else {\n // Optionally convert to object or truncate, per README\n return splitArray.slice(0, options.arrayLimit - currentArrayLength);\n }\n }\n return splitArray;\n}\n\nif (options.throwOnLimitExceeded && currentArrayLength >= options.arrayLimit) {\n throw new RangeError('Array limit exceeded. Only ' + options.arrayLimit + ' element' + (options.arrayLimit === 1 ? '' : 's') + ' allowed in an array.');\n}\n\nreturn val;\n```\nThis aligns behavior with indexed and bracket notations, reuses `currentArrayLength`, and respects `throwOnLimitExceeded`. Update README to note the consistent enforcement.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-2391.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "5.3", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-2391.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2026-2391", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.0005", "scoring_system": "epss", "scoring_elements": "0.15459", "published_at": "2026-05-07T12:55:00Z" }, { "value": "0.0005", "scoring_system": "epss", "scoring_elements": "0.15339", "published_at": "2026-05-05T12:55:00Z" }, { "value": "0.0005", "scoring_system": "epss", "scoring_elements": "0.15468", "published_at": "2026-04-29T12:55:00Z" }, { "value": "0.0005", "scoring_system": "epss", "scoring_elements": "0.15484", "published_at": "2026-04-21T12:55:00Z" }, { "value": "0.0005", "scoring_system": "epss", "scoring_elements": "0.15525", "published_at": "2026-04-24T12:55:00Z" }, { "value": "0.0005", "scoring_system": "epss", "scoring_elements": "0.15523", "published_at": "2026-04-26T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18264", "published_at": "2026-04-13T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18517", "published_at": "2026-04-04T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18227", "published_at": "2026-04-07T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.1831", "published_at": "2026-04-08T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18363", "published_at": "2026-04-11T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18316", "published_at": "2026-04-12T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18208", "published_at": "2026-04-16T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18462", "published_at": "2026-04-02T12:55:00Z" }, { "value": "0.00058", "scoring_system": "epss", "scoring_elements": "0.18221", "published_at": "2026-04-18T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-2391" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2391", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2391" }, { "reference_url": "https://github.com/ljharb/qs", "reference_id": "", "reference_type": "", "scores": [ { "value": "3.7", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L" }, { "value": "LOW", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/ljharb/qs" }, { "reference_url": "https://github.com/ljharb/qs/commit/f6a7abff1f13d644db9b05fe4f2c98ada6bf8482", "reference_id": "", "reference_type": "", "scores": [ { "value": "3.7", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L" }, { "value": "6.3", "scoring_system": "cvssv4", "scoring_elements": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N" }, { "value": "LOW", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-02-12T15:00:21Z/" } ], "url": "https://github.com/ljharb/qs/commit/f6a7abff1f13d644db9b05fe4f2c98ada6bf8482" }, { "reference_url": "https://github.com/ljharb/qs/security/advisories/GHSA-w7fw-mjwx-w883", "reference_id": "", "reference_type": "", "scores": [ { "value": "3.7", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L" }, { "value": "LOW", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" }, { "value": "6.3", "scoring_system": "cvssv4", "scoring_elements": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N" }, { "value": "LOW", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-02-12T15:00:21Z/" } ], "url": "https://github.com/ljharb/qs/security/advisories/GHSA-w7fw-mjwx-w883" }, { "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2391", "reference_id": "", "reference_type": "", "scores": [ { "value": "3.7", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L" }, { "value": "LOW", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2391" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1127940", "reference_id": "1127940", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1127940" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439353", "reference_id": "2439353", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439353" }, { "reference_url": "https://github.com/advisories/GHSA-w7fw-mjwx-w883", "reference_id": "GHSA-w7fw-mjwx-w883", "reference_type": "", "scores": [ { "value": "LOW", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" } ], "url": "https://github.com/advisories/GHSA-w7fw-mjwx-w883" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/64159?format=api", "purl": "pkg:npm/qs@6.14.2", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:npm/qs@6.14.2" } ], "aliases": [ "CVE-2026-2391", "GHSA-w7fw-mjwx-w883" ], "risk_score": 2.9, "exploitability": "0.5", "weighted_severity": "5.7", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-pxq3-b7gn-3yah" } ], "risk_score": null, "resource_url": "http://public2.vulnerablecode.io/packages/pkg:npm/qs@6.14.2" }