CVE-2026-39412

LiquidJS has an ownPropertyOnly bypass via sort_natural filter — prototype property information disclosure through sorting side-channel

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.

Affected

harttle · liquidjs

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 GITHUB

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.47% chance of exploitation in the next 30 days, 40th percentile

Published

2026-04-08

Updated

2026-04-09

Proof-of-concept exploits (1)

• advisories/GHSA-rv5g-f82m-qrvv

Security advisories

• harttle/liquidjs/security/advisories/GHSA-rv5g-f82m-qrvv
• harttle/liquidjs/pull/869

References

• CVE Record
• NVD entry