{"url":"http://public2.vulnerablecode.io/api/packages/96696?format=json","purl":"pkg:deb/debian/node-qs@6.15.0%2Bds%2B~6.15.0-3?distro=trixie","type":"deb","namespace":"debian","name":"node-qs","version":"6.15.0+ds+~6.15.0-3","qualifiers":{"distro":"trixie"},"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/173362?format=json","vulnerability_id":"VCID-c7tn-xmv7-mugk","summary":"qs before 6.10.3, as used in Express before 4.17.3 and other products, allows attackers to cause a Node process hang for an Express application because an __ proto__ key can be used. In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000. The fix was backported to qs 6.9.7, 6.8.3, 6.7.3, 6.6.1, 6.5.3, 6.4.1, 6.3.3, and 6.2.4 (and therefore Express 4.17.3, which has \"deps: qs@6.9.7\" in its release description, is not 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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.","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":"0.16007","published_at":"2026-06-11T12:55:00Z"}],"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://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://nvd.nist.gov/vuln/detail/CVE-2026-2391","reference_id":"CVE-2026-2391","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://github.com/ljharb/qs/commit/f6a7abff1f13d644db9b05fe4f2c98ada6bf8482","reference_id":"f6a7abff1f13d644db9b05fe4f2c98ada6bf8482","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/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"},{"reference_url":"https://github.com/ljharb/qs/security/advisories/GHSA-w7fw-mjwx-w883","reference_id":"GHSA-w7fw-mjwx-w883","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"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/96700?format=json","purl":"pkg:deb/debian/node-qs@6.15.0%2Bds%2B~6.15.0-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-qs@6.15.0%252Bds%252B~6.15.0-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/96696?format=json","purl":"pkg:deb/debian/node-qs@6.15.0%2Bds%2B~6.15.0-3?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-qs@6.15.0%252Bds%252B~6.15.0-3%3Fdistro=trixie"}],"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-ekaj-fc96-5ffh"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/95610?format=json","vulnerability_id":"VCID-vs6e-7ypb-9fga","summary":"Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.This issue affects qs: < 6.14.1.\n\n\nSummary\n\nThe arrayLimit option in qs did not enforce limits for bracket notation (a[]=1&a[]=2), only for indexed notation (a[0]=1). This is a consistency bug; arrayLimit should apply uniformly across all array notations.\n\nNote: The default parameterLimit of 1000 effectively mitigates the DoS scenario originally described. With default options, bracket notation cannot produce arrays larger than parameterLimit regardless of arrayLimit, because each a[]=valueconsumes one parameter slot. The severity has been reduced accordingly.\n\nDetails\n\nThe arrayLimit option only checked limits for indexed notation (a[0]=1&a[1]=2) but did not enforce it for bracket notation (a[]=1&a[]=2).\n\nVulnerable code (lib/parse.js:159-162):\n\nif (root === '[]' && options.parseArrays) {\n    obj = utils.combine([], leaf);  // No arrayLimit check\n}\n\n\n\n\n\nWorking code (lib/parse.js:175):\n\nelse if (index <= 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) without validating against options.arrayLimit, while indexed notation at line 175 checks index <= options.arrayLimit before creating arrays.\n\n\n\nPoC\n\nconst qs = require('qs');\nconst result = qs.parse('a[]=1&a[]=2&a[]=3&a[]=4&a[]=5&a[]=6', { arrayLimit: 5 });\nconsole.log(result.a.length);  // Output: 6 (should be max 5)\n\n\n\n\n\nNote on parameterLimit interaction: The original advisory's \"DoS demonstration\" claimed a length of 10,000, but parameterLimit (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 enforcement. With default parameterLimit, the practical DoS risk is negligible since parameterLimit already caps the total number of parsed parameters (and thus array elements from bracket notation). The risk increases only when parameterLimit is explicitly set to a very high value.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-15284.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-15284.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-15284","reference_id":"","reference_type":"","scores":[{"value":"0.00035","scoring_system":"epss","scoring_elements":"0.10873","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-15284"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-15284","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-15284"},{"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":"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:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ljharb/qs"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1124315","reference_id":"1124315","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1124315"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2425946","reference_id":"2425946","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2425946"},{"reference_url":"https://github.com/ljharb/qs/commit/3086902ecf7f088d0d1803887643ac6c03d415b9","reference_id":"3086902ecf7f088d0d1803887643ac6c03d415b9","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:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-12-30T14:55:26Z/"}],"url":"https://github.com/ljharb/qs/commit/3086902ecf7f088d0d1803887643ac6c03d415b9"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-15284","reference_id":"CVE-2025-15284","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:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-15284"},{"reference_url":"https://github.com/advisories/GHSA-6rw7-vpxm-498p","reference_id":"GHSA-6rw7-vpxm-498p","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-6rw7-vpxm-498p"},{"reference_url":"https://github.com/ljharb/qs/security/advisories/GHSA-6rw7-vpxm-498p","reference_id":"GHSA-6rw7-vpxm-498p","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":"MODERATE","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:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-12-30T14:55:26Z/"}],"url":"https://github.com/ljharb/qs/security/advisories/GHSA-6rw7-vpxm-498p"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:0261","reference_id":"RHSA-2026:0261","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:0261"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:0414","reference_id":"RHSA-2026:0414","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:0414"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:0531","reference_id":"RHSA-2026:0531","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:0531"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:0761","reference_id":"RHSA-2026:0761","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:0761"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:1000","reference_id":"RHSA-2026:1000","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:1000"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:1517","reference_id":"RHSA-2026:1517","reference_type":"","scores":[],"url":"https://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