High severity · published Mar 26, 2026
CVE-2026-33287
LiquidJS has Exponential Memory Amplification through its replace_first Filter $& Pattern
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to version 10.25.1, the `replace_first` filter in LiquidJS uses JavaScript's `String.prototype.replace()` which interprets `$&` 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
liquidjs · harttle
< 10.25.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33287
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33287
Patch
https://github.com/harttle/liquidjs/commit/35d523026345d80458df24c72e653db78b5d061d
Exploit
https://github.com/harttle/liquidjs/security/advisories/GHSA-6q5m-63h6-5x4v
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