LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. From 10.26.0 until 10.27.1, the strip_html filter in src/filters/html.ts can enter an infinite loop when an input string contains <, includes at least one preceding character, and has no later >. In strip_html, the search for the next opener advances lt while the loop index remains unchanged when the closer search returns -1, and the equality-only stall guard does not exit because the loop index is less than lt.
Reprocessing the same state indefinitely blocks template rendering and can cause denial of service with an input as short as a<. This issue is fixed in version 10.27.1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/harttle/liquidjs/commit/5c3522f33928aae66f0fe85c36e1d9015c76…
security-advisories@github.com
https://github.com/harttle/liquidjs/pull/917
security-advisories@github.com
https://github.com/harttle/liquidjs/releases/tag/v10.27.1
security-advisories@github.com
https://github.com/harttle/liquidjs/security/advisories/GHSA-m7fp-h3p4-hr49
security-advisories@github.com