# CVE-2026-41311: LiquidJS uncontrolled recursion in layout blocks

Source: https://junglewise.ai/threats/cve-2026-41311-liquidjs-uncontrolled-recursion-in-layout-blocks  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-09. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-41311 · Severity: high · CVSS 7.5 · Published 2026-05-09

liquidjs is a popular JavaScript template engine used in CMS platforms, email builders, and SaaS applications. An attacker who can submit a malicious template with circular block references can crash the entire Node.js process by exhausting memory, causing complete service disruption. The attack requires no authentication and can be triggered with a simple template containing nested blocks with identical names.

Technologies: [liquidjs (npm)](https://junglewise.ai/threats/technologies/liquidjs). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-41311 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-41311 being exploited in the wild.

**How severe is CVE-2026-41311?** High severity, with a CVSS score of 7.5, published 9 May 2026.

**Which products and versions are affected?** liquidjs (npm) < 10.25.7, SEMVER:introduced=0,fixed=10.25.7.

**Is there a fix for CVE-2026-41311?** Yes. liquidjs (npm): upgrade to 10.25.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-41311 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-41311?** Check whether you run liquidjs (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- liquidjs (npm): upgrade to 10.25.7 or later

  ```sh
  npm install liquidjs@10.25.7
  ```


## Technical details

The vulnerability exists in src/tags/block.ts in the getBlockRender method, which implements uncontrolled recursion (CWE-674). When rendering a block in OUTPUT mode, the code looks up a same-named block in the render context and calls its render function, passing the current block as an argument. If a child template contains a block with the same name as its parent, the inner block invokes the outer block's render function, which re-renders templates containing the inner block, creating infinite recursion with no termination condition. The attack vector is network-reachable with no authentication required—any application accepting user-submitted templates is vulnerable. An attacker can craft a template using Liquid's {% layout %} and {% block %} syntax to trigger memory exhaustion (~4GB) and cause an out-of-memory crash (FATAL ERROR: JavaScript heap out of memory). The vulnerability affects all versions up to and including 10.25.2, with a fix available in version 10.25.7.

## Affected products

- harttle liquidjs <10.25.7

## Identifiers

- CVE-2026-41311
- GHSA-4rc3-7j7w-m548

## Timeline

- 2026-04-24: disclosed
- 2026-04-19: patched: Fix committed; version 10.25.7 released with patch
- 2026-04-24: advisory: GHSA-4rc3-7j7w-m548 published

## References

- [https://github.com/harttle/liquidjs/security/advisories/GHSA-4rc3-7j7w-m548](https://github.com/harttle/liquidjs/security/advisories/GHSA-4rc3-7j7w-m548)
- [https://github.com/harttle/liquidjs/commit/e2311dfd6e82f73509308aa8a3a1fafc92e226f0](https://github.com/harttle/liquidjs/commit/e2311dfd6e82f73509308aa8a3a1fafc92e226f0)
- [https://github.com/harttle/liquidjs](https://github.com/harttle/liquidjs)
- [https://github.com/harttle/liquidjs/releases/tag/v10.25.7](https://github.com/harttle/liquidjs/releases/tag/v10.25.7)

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- [LiquidJS memory limit bypass in pop array filter](https://junglewise.ai/threats/cve-2026-55575-liquidjs-memory-limit-bypass-in-pop-array-filter)