LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. In versions 10.25.7 and below, the built-in strip_html filter uses a regex containing four flawed lazy-quantified alternatives, leading to ReDoS via quadratic backtracking. When the input contains many <script, <style, or <!-- opener tokens without matching closers, the V8 regex engine performs O(N²) backtracking, blocking the Node.js event loop. A single ~350 KB request ('<script'.repeat(50000)) stalls the process for ~10 seconds; cost grows quadratically with input size. The default memoryLimit: Infinity does not bound regex CPU, and even when configured strip_html only charges str.length to the limit — the regex itself runs unbounded. A single unauthenticated request containing crafted untrusted input can cause severe event-loop blocking and CPU amplification that saturates Node.js workers while bypassing memoryLimit protections. This issue has been fixed in version 10.26.0.
Advisories
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-r7g9-xpmj-5fcq | LiquidJS Vulnerable to ReDoS via Quadratic Backtracking in `strip_html` Filter Regex |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 18 Jun 2026 19:30:00 +0000
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| First Time appeared |
Harttle
Harttle liquidjs |
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| Vendors & Products |
Harttle
Harttle liquidjs |
Thu, 18 Jun 2026 16:45:00 +0000
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| Metrics |
ssvc
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Thu, 18 Jun 2026 04:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. In versions 10.25.7 and below, the built-in strip_html filter uses a regex containing four flawed lazy-quantified alternatives, leading to ReDoS via quadratic backtracking. When the input contains many <script, <style, or <!-- opener tokens without matching closers, the V8 regex engine performs O(N²) backtracking, blocking the Node.js event loop. A single ~350 KB request ('<script'.repeat(50000)) stalls the process for ~10 seconds; cost grows quadratically with input size. The default memoryLimit: Infinity does not bound regex CPU, and even when configured strip_html only charges str.length to the limit — the regex itself runs unbounded. A single unauthenticated request containing crafted untrusted input can cause severe event-loop blocking and CPU amplification that saturates Node.js workers while bypassing memoryLimit protections. This issue has been fixed in version 10.26.0. | |
| Title | LiquidJS: ReDoS via Quadratic Backtracking in `strip_html` Filter Regex | |
| Weaknesses | CWE-1333 | |
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-18T15:46:28.241Z
Reserved: 2026-05-12T20:31:43.448Z
Link: CVE-2026-45617
Updated: 2026-06-18T15:46:20.491Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-06-18T19:15:02Z
Weaknesses
Github GHSA