CVE-2026-39412 LiquidJS: ownPropertyOnly bypass via sort_natural filter — prototype property information disclosure through sorting side-channel
Attackers can extract sensitive prototype properties like API keys via a sorting side-channel in LiquidJS when ownPropertyOnly is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-39412?
CVE-2026-39412 is a medium-severity vulnerability in harttle liquidjs, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-39412?
2 open source packages ship an affected version, including liquidjs. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
liquidjs npm | All versions | 10.25.4 |
liquidjs npm | All versions | 10.25.4 |
Products include Liquidjs Liquidjs.
How do I fix CVE-2026-39412?
Upgrade liquidjs to 10.25.4 or later.
Is CVE-2026-39412 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39412 exists.
Other vulnerabilities in harttle liquidjs
- CVE-2026-30952 liquidjs has a path traversal fallback vulnerability
- CVE-2026-35525 LiquidJS has a root restriction bypass for partial and layout loading through symlinked templates
- CVE-2026-41311 LiquidJS is vulnerable to Denial of Service via circular block reference in layout
- CVE-2026-33285 LiquidJS: memoryLimit Bypass through Negative Range Values Leads to Process Crash
- CVE-2026-33287 LiquidJS has Exponential Memory Amplification through its replace_first Filter $& Pattern
Sources
Also known as GHSA-rv5g-f82m-qrvv, MINI-f69w-8762-mh4c, MINI-mmgq-73gf-hf4r.