CVE-2026-34166

LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.25.3, the replace filter in LiquidJS incorrectly accounts for memory usage when the memoryLimit option is enabled. It charges str.length + pattern.length + replacement.length bytes to the memory limiter, but the actual output from str.split(pattern).join(replacement) can be quadratically larger when the pattern occurs many times in the input string. This allows an attacker who controls template content to bypass the memoryLimit DoS protection with approximately 2,500x amplification, potentially causing out-of-memory conditions. This vulnerability is fixed in 10.25.3.

• CWE-400

• https://github.com/harttle/liquidjs/commit/abc058be0f33d6372cd2216f4945183167abeb25Patch
• https://github.com/harttle/liquidjs/releases/tag/v10.25.3Release Notes
• https://github.com/harttle/liquidjs/security/advisories/GHSA-mmg9-6m6j-jqqxExploit, Vendor Advisory

Published

Apr 8, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

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