node-qs — security advisory
Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.This issue affects qs: < 6.14.1. Summary The 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. Note: 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. Details The 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). Vulnerable code (lib/parse.js:159-162): if (root === '[]' && options.parseArrays) { obj = utils.combine([], leaf); // No arrayLimit check } Working code (lib/parse.js:175): else if (index <= options.arrayLimit) { // Limit checked here obj = []; obj[index] = leaf; } The 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. PoC const qs = require('qs'); const result = qs.parse('a[]=1&a[]=2&a[]=3&a[]=4&a[]=5&a[]=6', { arrayLimit: 5 }); console.log(result.a.length); // Output: 6 (should be max 5) Note on parameterLimit interaction: The original advisory's "D
- Products
- node-qs
- Affected versions
- 6.11.0+ds+~6.9.7-3, 6.11.0+ds+~6.9.7-4, 6.13.0+ds+~6.9.16-1, 6.14.1+ds+~6.14.0-1, 6.15.0+ds+~6.15.0-1, 6.15.0+ds+~6.15.0-2, 6.15.0+ds+~6.15.0-3, 6.15.2+ds+~6.15.1-1, 6.16.0+ds+~6.15.1-1
- Fixed versions
- 6.14.1+ds+~6.14.0-1
- CVEs
- CVE-2025-15284
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 16:55 UTC · Revision 1
Source evidence
Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.This issue affects qs: < 6.14.1. Summary The 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. Note: 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. Details The 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). Vulnerable code (lib/parse.js:159-162): if (root === '[]' && options.parseArrays) { obj = utils.combine([], leaf); // No arrayLimit check } Working code (lib/parse.js:175): else if (index <= options.arrayLimit) { // Limit checked here obj = []; obj[index] = leaf; } The 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. PoC const qs = require('qs'); const result = qs.parse('a[]=1&a[]=2&a[]=3&a[]=4&a[]=5&a[]=6', { arrayLimit: 5 }); console.log(result.a.length); // Output: 6 (should be max 5) Note on parameterLimit interaction: The original advisory's "D
osv:DEBIAN-CVE-2025-15284
node-qs
Fixed versions: Not specified
node-qs
Fixed versions: Not specified
node-qs
Fixed versions: 6.14.1+ds+~6.14.0-1
Complete source record
{
"id": "d5ca2b719d5c02e8aad908fabfd78c8b650faff65c73786aceddd1140bd358cf",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-15284",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-15284",
"summary": "Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.This issue affects qs: < 6.14.1. Summary The 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. Note: 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. Details The 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). Vulnerable code (lib/parse.js:159-162): if (root === '[]' && options.parseArrays) { obj = utils.combine([], leaf); // No arrayLimit check } Working code (lib/parse.js:175): else if (index <= options.arrayLimit) { // Limit checked here obj = []; obj[index] = leaf; } The 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. PoC const qs = require('qs'); const result = qs.parse('a[]=1&a[]=2&a[]=3&a[]=4&a[]=5&a[]=6', { arrayLimit: 5 }); console.log(result.a.length); // Output: 6 (should be max 5) Note on parameterLimit interaction: The original advisory's \"D",
"evidence": "osv:DEBIAN-CVE-2025-15284",
"products": [
{
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"evidence": "/affected/0/package/name"
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"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2025-15284",
"aliases": [
"DEBIAN-CVE-2025-15284"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
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"affected": [
{
"ranges": [
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"events": [
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"package": {
"name": "node-qs",
"purl": "pkg:deb/debian/node-qs?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
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"6.15.0+ds+~6.15.0-1",
"6.15.0+ds+~6.15.0-2",
"6.15.0+ds+~6.15.0-3",
"6.15.2+ds+~6.15.1-1",
"6.16.0+ds+~6.15.1-1"
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-15284.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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"package": {
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"ecosystem": "Debian:13"
},
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"6.15.0+ds+~6.15.0-1",
"6.15.0+ds+~6.15.0-2",
"6.15.0+ds+~6.15.0-3",
"6.15.2+ds+~6.15.1-1",
"6.16.0+ds+~6.15.1-1"
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"database_specific": {
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},
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{
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"versions": [
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}
}
],
"modified": "2026-10-15T09:47:44.335825014Z",
"provider": "osv",
"upstream": [
"CVE-2025-15284"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-15284"
]
},
"related_cves": [
{
"value": "CVE-2025-15284",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 328576,
"published_at": "2025-12-29T23:15:42.703+00:00"
}