What’s Vulnerable › Vulnerabilities

CVE-2026-34166: LiquidJS has a Memory Limit Bypass via Quadratic Amplification in `replace` Filter

• Severity: medium (CVSS 5.3 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: 2026-04-08 · updated 2026-07-24
• Weakness: CWE-400

Description

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.

Affected products

• harttle liquidjs: before 10.25.3 — fixed in 10.25.3

How to fix

Upgrade to a fixed version: harttle liquidjs 10.25.3. Check the vendor advisory for mitigations.

References

• https://github.com/harttle/liquidjs/commit/abc058be0f33d6372cd2216f4945183167abeb25
• https://github.com/harttle/liquidjs/releases/tag/v10.25.3
• https://github.com/harttle/liquidjs/security/advisories/GHSA-mmg9-6m6j-jqqx

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