sift 17.1.3 Prototype Pollution Remote Code Execution via $where
sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-85625
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:54 UTC · Revision 1
Source evidence
sift 17.1.3 Prototype Pollution Remote Code Execution via $where
core-osv · Original sourcePublished 4 Sept 2026, 14:32 UTC
sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.
osv:CVE-2026-85625
Complete source record
{
"id": "0e77aeb1c3fd420e6a84b335f9aa84447310db8c023d3f774228a8c9839013b5",
"url": "https://osv.dev/vulnerability/CVE-2026-85625",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "sift 17.1.3 Prototype Pollution Remote Code Execution via $where",
"summary": "sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.",
"evidence": "osv:CVE-2026-85625",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-85625",
"aliases": [
"CVE-2026-85625"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/crcn/sift.js",
"type": "GIT",
"events": [
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"introduced": "0"
},
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"last_affected": "8a9a4995d4a2a653bf9b68a7a2d72e02f05dfe03"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
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{
"last_affected": "17.1.3"
}
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"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
}
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85625.json"
}
}
],
"modified": "2026-10-28T02:30:49.055608952Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85625.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-85625",
"https://www.vulncheck.com/advisories/sift-17.1.3-prototype-pollution-remote-code-execution-via-where",
"https://github.com/crcn/sift.js/issues/276",
"https://github.com/crcn/sift.js",
"https://github.com/crcn/sift.js/blob/v17.1.3/src/core.ts"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1321"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85625.json"
}
},
"related_cves": [
{
"value": "CVE-2026-85625",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517535,
"published_at": "2026-09-04T14:32:15.388+00:00"
}