Memory Limit Bypass in LiquidJS Template Engine

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: GitHub, Inc.

Description

LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.27.2, the join filter in src/filters/array.ts computes complexity from array.length and separator length instead of the total string length produced by array.join(sep). The concat filter can cheaply double arrays of references, after which join materializes the referenced content while charging only for element count, allowing a template to exceed a configured memoryLimit by a large factor. The sibling array_to_sentence_string filter in src/filters/string.ts has the same accounting defect, and a crafted template can allocate toward V8's string or process memory limit and crash the process. This issue is fixed in version 10.27.2.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-19

Last Modified

2026-08-19

Generated

2026-08-20

AI Q&A

2026-08-20

EPSS Evaluated

N/A

NVD

CVE-2026-69222

Affected Vendors & Products

Vendor	Product	Version / Range
liquidjs	liquidjs	to 10.27.2 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This vulnerability affects LiquidJS, a JavaScript template engine. The join and concat filters incorrectly calculate memory usage by using array length and separator length instead of the actual string length produced. This allows templates to consume much more memory than expected, potentially crashing the process by exceeding memory limits.

Impact Analysis

If you use LiquidJS versions before 10.27.2, an attacker could craft a template that allocates excessive memory, causing your application to crash or become unresponsive. This could lead to denial-of-service conditions or unexpected behavior in your system.

Mitigation Strategies

Update LiquidJS to version 10.27.2 or later to address the memory accounting flaw in the join and array_to_sentence_string filters.

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