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Summary A ReDOS that exists on currency.js was discovered by Gauss Security Labs R&D team.
Details https://github.com/NaturalIntelligence/fast-xml-parser/blob/v4.4.0/src/v5/valueParsers/currency.js#L10 contains a vulnerable regex
PoC pass the following string '\t'.repeat(13337) + '.'
Impact Denial of service during currency parsing in experimental version 5 of fast-xml-parser-library
https://gauss-security.com
Impact "fast-xml-parser" allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for DoS attacks. By crafting an entity name that results in an intentionally bad performing regex and utilizing it in the entity replacement step of the parser, this can cause the parser to stall for an indefinite amount of time.
Patches The problem has been resolved in v4.2.4
Workarounds Avoid using DOCTYPE parsing by processEntities: false option.