Medium severity5.7NVD Advisory· Published Dec 8, 2020· Updated Jun 17, 2026
CVE-2020-26256
CVE-2020-26256
Description
Fast-csv is an npm package for parsing and formatting CSVs or any other delimited value file in node. In fast-cvs before version 4.3.6 there is a possible ReDoS vulnerability (Regular Expression Denial of Service) when using ignoreEmpty option when parsing. This has been patched in v4.3.6 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 This vulnerability was found using a CodeQL query which identified EMPTY_ROW_REGEXP regular expression as vulnerable.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fast-csvnpm | < 4.3.6 | 4.3.6 |
@fast-csv/parsenpm | < 4.3.6 | 4.3.6 |
Affected products
3- ghsa-coords2 versions
< 4.3.6+ 1 more
- (no CPE)range: < 4.3.6
- (no CPE)range: < 4.3.6
- C2FO/fast-csvv5Range: < 4.3.6
Patches
Vulnerability mechanics
References
12- github.com/C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829envdPatchThird Party AdvisoryWEB
- lgtm.com/query/8609731774537641779/nvdExploitThird Party Advisory
- github.com/C2FO/fast-csv/issues/540nvdThird Party AdvisoryWEB
- github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwpnvdThird Party AdvisoryWEB
- github.com/advisories/GHSA-8cv5-p934-3hwpghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-26256ghsaADVISORY
- www.npmjs.com/package/fast-csvnvdProductThird Party AdvisoryWEB
- lgtm.com/query/8609731774537641779ghsaWEB
- www.npmjs.com/advisories/1587ghsaWEB
- www.npmjs.com/advisories/1588ghsaWEB
- www.npmjs.com/package/@fast-csv/parseghsaWEB
- www.npmjs.com/package/%40fast-csv/parsenvd
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