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CVE-2026-44646— LiquidJS: `{% render %}` tag silently bypasses per-render `ownPropertyOnly:true` via `Context.spawn()`

Quick assessment

Affected
harttle liquidjs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

harttle liquidjs是harttle的嵌入式Web服务器。 harttle liquidjs 10.25.7之前版本存在处理逻辑错误漏洞，该漏洞源于Context.spawn()未正确继承父环境的ownPropertyOnly值，导致原型链属性泄露。

CVSS 5.3 · Medium EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
harttle liquidjs < 10.26.0 affected
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I. Basic Information for CVE-2026-44646

Vulnerability Information
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Vulnerability Title
LiquidJS: `{% render %}` tag silently bypasses per-render `ownPropertyOnly:true` via `Context.spawn()`
Source: CVE Program / CVE List V5
Vulnerability Description
LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. In versions 10.25.7 and below, Context.spawn() creates a child Context for the {% render %} tag but does not propagate the parent context's resolved ownPropertyOnly value, resulting in a silent bypass. The new context re-derives ownPropertyOnly from opts.ownPropertyOnly (the instance-level option), silently discarding any RenderOptions.ownPropertyOnly override that was supplied to parseAndRender(). As a result, a developer who runs a Liquid instance with the backwards-compatible ownPropertyOnly:false and then locks down an untrusted render with parseAndRender(..., { ownPropertyOnly: true }) still leaks prototype-chain properties from inside any {% render %} partial. This is a distinct exploit surface from the previously identified array-filter variants (where, reject, group_by, find, find_index, has) — the underlying root cause in Context.spawn() is shared, but {% render %} is a separately reachable sink that needs no filter usage. This issue has been fixed in version 10.26.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5
Vulnerability Title
harttle liquidjs 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
harttle liquidjs是harttle的嵌入式Web服务器。 harttle liquidjs 10.25.7之前版本存在处理逻辑错误漏洞，该漏洞源于Context.spawn()未正确继承父环境的ownPropertyOnly值，导致原型链属性泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
harttle liquidjs < 10.26.0 -

II. Public POCs for CVE-2026-44646

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III. Intelligence Information for CVE-2026-44646

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Patches & Fixes for CVE-2026-44646 (1)

Vendor Advisories for CVE-2026-44646 (1)

Vendor Pages for CVE-2026-44646 (1)

Same Patch Batch · harttle · 2026-06-17 · 5 CVEs total

CVE-2026-45617 7.5 HIGH LiquidJS: ReDoS via Quadratic Backtracking in `strip_html` Filter Regex
CVE-2026-45357 7.5 HIGH LiquidJS: Memory and render limit bypass via unbounded width padding in `date` filter (str
CVE-2026-44645 6.5 MEDIUM LiquidJS has a renderLimit DoS guard bypass via empty `{% for %}` body
CVE-2026-44644 6.1 MEDIUM LiquidJS's strip_html filter bypass via newline characters in HTML tags enables XSS

IV. Related Vulnerabilities

Same product: liquidjs
Same vendor: harttle
Same weakness: CWE-693

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