{"cve":"CVE-2020-26256","nvd":{"published":"2020-12-08T22:15:17.540","modified":"2026-06-17T03:07:56.073","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-400"],"references":["https://github.com/C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829e","https://github.com/C2FO/fast-csv/issues/540","https://github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp","https://lgtm.com/query/8609731774537641779/","https://www.npmjs.com/package/%40fast-csv/parse"],"products":["c2fo:fast-csv"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-26256","score":0.01537,"percentile":0.74864,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8cv5-p934-3hwp","url":"https://osv.dev/vulnerability/GHSA-8cv5-p934-3hwp","summary":"Denial of service in fast-csv","modified":"2026-09-10T03:49:00.474887627Z","packages":[{"ecosystem":"npm","name":"fast-csv","purl":"pkg:npm/fast-csv","ranges":["<4.3.6"],"fixed":["4.3.6"]},{"ecosystem":"npm","name":"@fast-csv/parse","purl":"pkg:npm/%40fast-csv/parse","ranges":["<4.3.6"],"fixed":["4.3.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}