What’s Vulnerable › Vulnerabilities

CVE-2026-106120: LiquidJS: ownPropertyOnly bypass for inherited array indices in first/last/join/reverse/slice/compact, `.first`/`.last`, negative index, and for-loop iteration

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-09
• Weakness: CWE-200

Description

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.

Affected products

• harttle liquidjs: before 10.27.2

References

• https://github.com/harttle/liquidjs/commit/552819a84b80c62306fe61072628a756272dc749
• https://github.com/harttle/liquidjs/pull/924
• https://github.com/harttle/liquidjs/releases/tag/v10.27.2
• https://github.com/harttle/liquidjs/security/advisories/GHSA-fwxr-j5w2-587m
• https://github.com/harttle/liquidjs/security/advisories/GHSA-fwxr-j5w2-587m

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