harttle liquidjs up to 10.25.0 String.prototype.replace denial of service

Summaryinfo

A vulnerability described as problematic has been identified in harttle liquidjs up to 10.25.0. Affected by this vulnerability is the function String.prototype.replace. Such manipulation leads to denial of service. This vulnerability is referenced as CVE-2026-33287. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in harttle liquidjs up to 10.25.0. Affected by this issue is the function String.prototype.replace. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to version 10.25.1, the `replace_first` filter in LiquidJS uses JavaScript's `String.prototype.replace()` which interprets `$&` as a back reference to the matched substring. The filter only charges `memoryLimit` for the input string length, not the amplified output. An attacker can achieve exponential memory amplification (up to 625,000:1) while staying within the `memoryLimit` budget, leading to denial of service. Version 10.25.1 patches the issue.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-33287 since 03/18/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 10.25.1 eliminates this vulnerability. Applying the patch 35d523026345d80458df24c72e653db78b5d061d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• harttle

Name

• liquidjs

Version

• 10.0
• 10.1
• 10.2
• 10.3
• 10.4
• 10.5
• 10.6
• 10.7
• 10.8
• 10.9
• 10.10
• 10.11
• 10.12
• 10.13
• 10.14
• 10.15
• 10.16
• 10.17
• 10.18
• 10.19
• 10.20
• 10.21
• 10.22
• 10.23
• 10.24
• 10.25.0

License

• open-source

Website

• Product: https://github.com/harttle/liquidjs/

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