What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-26 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• harttle liquidjs: before 10.25.1 — fixed in 10.25.1

How to fix

Upgrade to a fixed version: harttle liquidjs 10.25.1. Check the vendor advisory for mitigations.

References

• https://github.com/harttle/liquidjs/commit/35d523026345d80458df24c72e653db78b5d061d
• https://github.com/harttle/liquidjs/security/advisories/GHSA-6q5m-63h6-5x4v
• https://github.com/harttle/liquidjs/security/advisories/GHSA-6q5m-63h6-5x4v

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