Regular Expression Denial of Service

Overview

fast-csv and @fast-csv/parse before version 4.3.6 has a possible ReDoS vulnerability (Regular Expression Denial of Service) when using ignoreEmpty option when parsing.

Impact

You will only be affected by this if you use the ignoreEmpty parsing option. If you do use this option it is recommended that you upgrade to the latest version v4.3.6

Patches

This has been patched in v4.3.6

This vulnerability was found using a CodeQL query which identified EMPTY_ROW_REGEXP regular expression as vulnerable.

Recommendation

Upgrade to version 4.3.6 or later.

References

• https://github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp
• https://lgtm.com/query/8609731774537641779/
• https://github.com/C2FO/fast-csv/issues/540
• https://github.com/C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829e
• https://www.npmjs.com/package/@fast-csv/parse
• https://www.npmjs.com/package/fast-csv
• GitHub Advisory