{"id":"CVE-2020-26256","details":"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.","aliases":["GHSA-8cv5-p934-3hwp"],"modified":"2026-03-20T11:35:25.669331Z","published":"2020-12-08T22:15:17.540Z","related":["GHSA-8cv5-p934-3hwp"],"references":[{"type":"WEB","url":"https://www.npmjs.com/package/%40fast-csv/parse"},{"type":"ADVISORY","url":"https://github.com/C2FO/fast-csv/issues/540"},{"type":"ADVISORY","url":"https://github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp"},{"type":"ADVISORY","url":"https://www.npmjs.com/package/fast-csv"},{"type":"FIX","url":"https://github.com/C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829e"},{"type":"EVIDENCE","url":"https://lgtm.com/query/8609731774537641779/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/c2fo/fast-csv","events":[{"introduced":"0"},{"fixed":"3dc859edb19924b315051e4c87d6273808a0de73"},{"fixed":"4bbd39f26a8cd7382151ab4f5fb102234b2f829e"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"4.3.6"}]}}],"versions":["v0.1.0","v0.1.1","v0.1.2","v0.2.0","v0.2.1","v0.2.2","v0.3.0","v0.4.0","v0.4.1","v0.4.2","v0.4.3","v0.4.4","v0.5.0","v0.5.1","v0.5.2","v0.5.3","v0.5.4","v0.5.5","v0.5.6","v0.5.7","v0.6.0","v1.0.0","v1.1.0","v2.0.0","v2.0.1","v2.2.0","v2.3.0","v3.0.2","v3.2.0","v3.3.0","v3.4.0","v3.5.0","v3.6.0","v3.7.0","v4.0.0","v4.0.0-alpha.0","v4.0.1","v4.0.2","v4.0.3","v4.1.0","v4.1.1","v4.1.2","v4.1.3","v4.1.4","v4.1.5","v4.1.6","v4.2.0","v4.3.0","v4.3.1","v4.3.2","v4.3.3","v4.3.4","v4.3.5"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-26256.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}