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CVE-2026-33287— LiquidJS has Exponential Memory Amplification through its replace_first Filter $& Pattern

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.

liquidjs是Jun Yang个人开发者的一个简单、表达、安全且兼容 Shopify 的纯 JavaScript 模板引擎。 LiquidJS 10.25.1之前版本存在安全漏洞，该漏洞源于replace_first过滤器使用String.prototype.replace方法且内存限制计算不当，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.53% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-33287

Vulnerability Information
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Vulnerability Title
LiquidJS has Exponential Memory Amplification through its replace_first Filter $& Pattern
Source: CVE Program / CVE List V5
Vulnerability Description
LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to version 10.25.1, the `replace_first` filter in LiquidJS uses JavaScript's `String.prototype.replace()` which interprets `$&` as a back reference to the matched substring. The filter only charges `memoryLimit` for the input string length, not the amplified output. An attacker can achieve exponential memory amplification (up to 625,000:1) while staying within the `memoryLimit` budget, leading to denial of service. Version 10.25.1 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
liquidjs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
liquidjs是Jun Yang个人开发者的一个简单、表达、安全且兼容 Shopify 的纯 JavaScript 模板引擎。 LiquidJS 10.25.1之前版本存在安全漏洞，该漏洞源于replace_first过滤器使用String.prototype.replace方法且内存限制计算不当，可能导致拒绝服务攻击。
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 < 10.25.1 -

II. Public POCs for CVE-2026-33287

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III. Intelligence Information for CVE-2026-33287

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Patches & Fixes for CVE-2026-33287 (1)

Vendor Advisories for CVE-2026-33287 (1)

IV. Related Vulnerabilities

Same product: liquidjs
Same vendor: harttle
Same weakness: CWE-20

V. Comments for CVE-2026-33287

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