CVE-2026-33287: Liquidjs

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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

• Liquidjs Liquidjs: before 10.25.1 (fixed in 10.25.1)

Published 2026-03-26. Last modified 2026-06-17.