Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Liquidjs | Liquidjs | < 10.25.3 |
Related Weaknesses (CWE)
References
- https://github.com/harttle/liquidjs/commit/abc058be0f33d6372cd2216f4945183167abePatch
- https://github.com/harttle/liquidjs/releases/tag/v10.25.3Release Notes
- https://github.com/harttle/liquidjs/security/advisories/GHSA-mmg9-6m6j-jqqxExploitVendor Advisory
FAQ
What is CVE-2026-34166?
CVE-2026-34166 is a vulnerability with a CVSS score of 3.7 (LOW). 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 i...
How severe is CVE-2026-34166?
CVE-2026-34166 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34166?
Check the references section above for vendor advisories and patch information. Affected products include: Liquidjs Liquidjs.