Information disclosure in Harttle Liquidjs
CVE-2026-39412
LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.25.4, the sort_natural filter bypasses the ownPropertyOnly security option, allowing template authors to extract values of prototype-inherited properties through a sorting side-channel attack. Applications relying on ownPropertyOnly: true as a security boundary (e.g., multi-tenant template systems) are exposed to information disclosure of sensitive prototype properties such as API keys and tokens. This vulnerability is fixed in 10.25.4.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Harttle Liquidjs — versions < 10.25.4
- Liquidjs
Weakness classification (CWE)
References
- github.com/harttle/liquidjs/security/advisories/GHSA-rv5g-f82m-qrvv (Exploit, Vendor Advisory)
- github.com/harttle/liquidjs/pull/869 (Product, Issue Tracking)
- github.com/harttle/liquidjs/commit/e743da0020d34e2ee547e1cc1a86b58377ebe1ce (Patch)
- github.com/harttle/liquidjs/releases/tag/v10.25.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-39412?
- CVE-2026-39412 is a medium-severity vulnerability in Harttle Liquidjs, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-08.
- How severe is CVE-2026-39412?
- Medium severity. CVSS v3 base score is 5.3 out of 10.