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.