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CVE-2026-33287
JavaScript vulnerability analysis and mitigation

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.


SourceNVD

Related JavaScript vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-33287HIGH7.5
  • JavaScriptJavaScript
  • liquidjs
NoNoMar 26, 2026
CVE-2026-33285HIGH7.5
  • JavaScriptJavaScript
  • liquidjs
NoNoMar 26, 2026
CVE-2026-33671HIGH7.5
  • JavaScriptJavaScript
  • picomatch
NoYesMar 25, 2026
CVE-2026-33672MEDIUM5.3
  • JavaScriptJavaScript
  • picomatch
NoYesMar 25, 2026
GHSA-v3rj-xjv7-4jmqMEDIUM5.3
  • JavaScriptJavaScript
  • smol-toml
NoYesMar 25, 2026

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