The package printf before 0.6.1 are vulnerable to Regular Expression Denial of Service (ReDoS) via the regex string /%(?:(([w_.]+))|([1-9]d*)$)?([0 +-]*)(*|d+)?(.)?(*|d+)?[hlL]?([%bscdeEfFgGioOuxX])/g in lib/printf.js. The vulnerable regular expression has cubic worst-case time complexity.

Source: CVE-2021-23354

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