Medium
LiquidJS: ownPropertyOnly bypass for inherited array indices in first/last/join/reverse/slice/compact, `.first`/`.last`, negative index, and for-loop iteration
Type: advisorySources: OSV
LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.27.2, enabling ownPropertyOnly does not consistently restrict inherited array indices because negative indexing, .first, .last, the first filter, the last filter, join, reverse, slice, compact, and for-loop iteration can read prototype-provided elements outside readJSProperty(). An attacker who can influence prototype state or inherited array-index data and cause templates to render affected operations can disclose values that ownPropertyOnly is expected to hide. Direct positive indexing and ordinary object prototype reads are blocked, but the alternate array paths remain affected. This issue is fixed in 10.27.2.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-106120
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:54 UTC · Revision 1
Source evidence
LiquidJS: ownPropertyOnly bypass for inherited array indices in first/last/join/reverse/slice/compact, `.first`/`.last`, negative index, and for-loop iteration
core-osv · Original sourcePublished 6 Oct 2026, 18:04 UTC
LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.27.2, enabling ownPropertyOnly does not consistently restrict inherited array indices because negative indexing, .first, .last, the first filter, the last filter, join, reverse, slice, compact, and for-loop iteration can read prototype-provided elements outside readJSProperty(). An attacker who can influence prototype state or inherited array-index data and cause templates to render affected operations can disclose values that ownPropertyOnly is expected to hide. Direct positive indexing and ordinary object prototype reads are blocked, but the alternate array paths remain affected. This issue is fixed in 10.27.2.
osv:CVE-2026-106120
Complete source record
{
"id": "914b003a7d061ad9692436f7f8c5fcf7e6eee1ca8fc8ebd0e8098a1672d4635a",
"url": "https://osv.dev/vulnerability/CVE-2026-106120",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "LiquidJS: ownPropertyOnly bypass for inherited array indices in first/last/join/reverse/slice/compact, `.first`/`.last`, negative index, and for-loop iteration",
"summary": "LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.27.2, enabling ownPropertyOnly does not consistently restrict inherited array indices because negative indexing, .first, .last, the first filter, the last filter, join, reverse, slice, compact, and for-loop iteration can read prototype-provided elements outside readJSProperty(). An attacker who can influence prototype state or inherited array-index data and cause templates to render affected operations can disclose values that ownPropertyOnly is expected to hide. Direct positive indexing and ordinary object prototype reads are blocked, but the alternate array paths remain affected. This issue is fixed in 10.27.2.",
"evidence": "osv:CVE-2026-106120",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-106120",
"aliases": [
"CVE-2026-106120",
"GHSA-fwxr-j5w2-587m"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
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{
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{
"repo": "https://github.com/harttle/liquidjs",
"type": "GIT",
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"modified": "2026-10-28T02:30:31.009330722Z",
"provider": "osv",
"references": [
"https://github.com/harttle/liquidjs/releases/tag/v10.27.2",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106120.json",
"https://github.com/harttle/liquidjs/security/advisories/GHSA-fwxr-j5w2-587m",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106120",
"https://github.com/harttle/liquidjs/commit/552819a84b80c62306fe61072628a756272dc749",
"https://github.com/harttle/liquidjs/pull/924"
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}
},
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{
"value": "CVE-2026-106120",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498056,
"published_at": "2026-10-06T18:04:14.907+00:00"
}