node-qs — security advisory
### Summary `qs.stringify` with `arrayFormat: 'comma'` throws `TypeError: Cannot convert object to primitive value` when an array element cannot be coerced to a string, such as an object with an own non-callable `toString` (`{ "toString": "x" }`) or a null-prototype object. The comma format joins array elements with `Array.prototype.join` and, under `encodeValuesOnly`, first passes each element through `String()` in `utils.encode`; neither guards against an element whose string coercion fails. ### Details In `lib/stringify.js`, the comma branch collapses the array with `obj.join(',')`. For an element whose own `toString` is not callable, `ToPrimitive` skips it, falls through to `Object.prototype.valueOf` (which returns the object itself), and throws. Under `encodeValuesOnly: true`, the same element first reaches `String(str)` in `utils.encode` (`lib/utils.js`) and throws there. Nested arrays (`{ "a": [[{ "toString": "x" }]] }`) throw the same way, through `Array.prototype.toString`. The `indices`, `brackets`, and `repeat` formats walk into object elements instead of coercing them, and are not affected. Such elements can come from untrusted input. `JSON.parse` produces `{ "a": [{ "toString": "x" }] }` with no qs option involved. `qs.parse("a[0][toString]=x", { allowPrototypes: true })` keeps the `toString` key, and `qs.parse("a[][b]=c", { plainObjects: true })` produces a null-prototype element; the default parse options drop `toString` and produce ordinary objects, which do n
- 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
- Not specified
- CVEs
- CVE-2026-110816
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:37 UTC · Revision 1
Source evidence
### Summary `qs.stringify` with `arrayFormat: 'comma'` throws `TypeError: Cannot convert object to primitive value` when an array element cannot be coerced to a string, such as an object with an own non-callable `toString` (`{ "toString": "x" }`) or a null-prototype object. The comma format joins array elements with `Array.prototype.join` and, under `encodeValuesOnly`, first passes each element through `String()` in `utils.encode`; neither guards against an element whose string coercion fails. ### Details In `lib/stringify.js`, the comma branch collapses the array with `obj.join(',')`. For an element whose own `toString` is not callable, `ToPrimitive` skips it, falls through to `Object.prototype.valueOf` (which returns the object itself), and throws. Under `encodeValuesOnly: true`, the same element first reaches `String(str)` in `utils.encode` (`lib/utils.js`) and throws there. Nested arrays (`{ "a": [[{ "toString": "x" }]] }`) throw the same way, through `Array.prototype.toString`. The `indices`, `brackets`, and `repeat` formats walk into object elements instead of coercing them, and are not affected. Such elements can come from untrusted input. `JSON.parse` produces `{ "a": [{ "toString": "x" }] }` with no qs option involved. `qs.parse("a[0][toString]=x", { allowPrototypes: true })` keeps the `toString` key, and `qs.parse("a[][b]=c", { plainObjects: true })` produces a null-prototype element; the default parse options drop `toString` and produce ordinary objects, which do n
osv:DEBIAN-CVE-2026-110816
node-qs
Fixed versions: Not specified
node-qs
Fixed versions: Not specified
node-qs
Fixed versions: Not specified
Complete source record
{
"id": "c1f60da5d6c703ffa01ead80fb01caa6c7274b2a8f532b55715dfb5358df2202",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-110816",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-110816",
"summary": "### Summary `qs.stringify` with `arrayFormat: 'comma'` throws `TypeError: Cannot convert object to primitive value` when an array element cannot be coerced to a string, such as an object with an own non-callable `toString` (`{ \"toString\": \"x\" }`) or a null-prototype object. The comma format joins array elements with `Array.prototype.join` and, under `encodeValuesOnly`, first passes each element through `String()` in `utils.encode`; neither guards against an element whose string coercion fails. ### Details In `lib/stringify.js`, the comma branch collapses the array with `obj.join(',')`. For an element whose own `toString` is not callable, `ToPrimitive` skips it, falls through to `Object.prototype.valueOf` (which returns the object itself), and throws. Under `encodeValuesOnly: true`, the same element first reaches `String(str)` in `utils.encode` (`lib/utils.js`) and throws there. Nested arrays (`{ \"a\": [[{ \"toString\": \"x\" }]] }`) throw the same way, through `Array.prototype.toString`. The `indices`, `brackets`, and `repeat` formats walk into object elements instead of coercing them, and are not affected. Such elements can come from untrusted input. `JSON.parse` produces `{ \"a\": [{ \"toString\": \"x\" }] }` with no qs option involved. `qs.parse(\"a[0][toString]=x\", { allowPrototypes: true })` keeps the `toString` key, and `qs.parse(\"a[][b]=c\", { plainObjects: true })` produces a null-prototype element; the default parse options drop `toString` and produce ordinary objects, which do n",
"evidence": "osv:DEBIAN-CVE-2026-110816",
"products": [
{
"name": {
"value": "node-qs",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.11.0+ds+~6.9.7-3",
"evidence": "/affected/0/versions"
},
{
"value": "6.11.0+ds+~6.9.7-4",
"evidence": "/affected/0/versions"
},
{
"value": "6.13.0+ds+~6.9.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.14.1+ds+~6.14.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.15.0+ds+~6.15.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.15.0+ds+~6.15.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "6.15.0+ds+~6.15.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "6.15.2+ds+~6.15.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.16.0+ds+~6.15.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "node-qs",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.13.0+ds+~6.9.16-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.14.1+ds+~6.14.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.15.0+ds+~6.15.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.15.0+ds+~6.15.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "6.15.0+ds+~6.15.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "6.15.2+ds+~6.15.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.16.0+ds+~6.15.1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "node-qs",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.13.0+ds+~6.9.16-1",
"evidence": "/affected/2/versions"
},
{
"value": "6.14.1+ds+~6.14.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "6.15.0+ds+~6.15.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "6.15.0+ds+~6.15.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "6.15.0+ds+~6.15.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "6.15.2+ds+~6.15.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "6.16.0+ds+~6.15.1-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-110816",
"aliases": [
"DEBIAN-CVE-2026-110816"
],
"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:N/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"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-qs",
"purl": "pkg:deb/debian/node-qs?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-110816.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-qs",
"purl": "pkg:deb/debian/node-qs?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-110816.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-qs",
"purl": "pkg:deb/debian/node-qs?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-110816.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:48.741599415Z",
"provider": "osv",
"upstream": [
"CVE-2026-110816"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-110816"
]
},
"related_cves": [
{
"value": "CVE-2026-110816",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 419066,
"published_at": "2026-10-14T22:17:23.23+00:00"
}