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Vulnerable Regular Expression #79

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@cristianstaicu

The following regular expression used in parsing the HTML documents is vulnerable to ReDoS:

/(^\s+|\s+$)/g

The slowdown is moderately low: for 50.000 characters around 2.5 seconds matching time. However, I would still suggest one of the following:

  • remove the regex,
  • anchor the regex,
  • limit the number of characters that can be matched by the repetition,
  • limit the input size.

If needed, I can provide an actual example showing the slowdown.

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