{"id":"GHSA-8cv5-p934-3hwp","summary":"Denial of service in fast-csv","details":"### Impact\nPossible ReDoS (Regular Expression Denial of Service) when using `ignoreEmpty` option when parsing.\n\n### Patches\nThis has been patched in `v4.3.6`\n\n### Workarounds\nYou 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`\n\n### References\n\nThis vulnerability was found using a [CodeQL](https://securitylab.github.com/tools/codeql) query which identified `EMPTY_ROW_REGEXP` regular expression as vulnerable.\n[Link to query run](https://lgtm.com/query/8609731774537641779/). \n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [fast-csv](https://github.com/C2FO/fast-csv)","aliases":["CVE-2020-26256"],"modified":"2026-09-10T03:49:00.474887627Z","published":"2020-12-08T21:42:53Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2020-12-08T21:42:31Z","nvd_published_at":"2020-12-08T22:15:00Z","cwe_ids":["CWE-400"],"severity":"LOW"},"references":[{"type":"WEB","url":"https://github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26256"},{"type":"WEB","url":"https://github.com/C2FO/fast-csv/issues/540"},{"type":"WEB","url":"https://github.com/C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829e"},{"type":"PACKAGE","url":"https://github.com/C2FO/fast-csv"},{"type":"WEB","url":"https://lgtm.com/query/8609731774537641779"},{"type":"WEB","url":"https://www.npmjs.com/advisories/1587"},{"type":"WEB","url":"https://www.npmjs.com/advisories/1588"},{"type":"WEB","url":"https://www.npmjs.com/package/@fast-csv/parse"},{"type":"WEB","url":"https://www.npmjs.com/package/fast-csv"}],"affected":[{"package":{"name":"fast-csv","ecosystem":"npm","purl":"pkg:npm/fast-csv"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.3.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/12/GHSA-8cv5-p934-3hwp/GHSA-8cv5-p934-3hwp.json"}},{"package":{"name":"@fast-csv/parse","ecosystem":"npm","purl":"pkg:npm/%40fast-csv/parse"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.3.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/12/GHSA-8cv5-p934-3hwp/GHSA-8cv5-p934-3hwp.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"}]}