{"cve":{"cve_id":"CVE-2020-26256","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.01531,"epss_percentile":0.71494,"epss_as_of":"2026-06-23","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.","published_at":"2020-12-08T21:45:19Z","last_modified_at":null,"cvss_v3_score":5.7,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-400"],"nvd_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/%40fast-csv/parse","https://www.npmjs.com/package/fast-csv"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:13:56.882959Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"c2fo","vendor_name":"C2FO","product_slug":"fast-csv","product_name":"fast-csv","version_start":"< 4.3.6","version_start_inclusive":true,"version_end":"< 4.3.6","version_end_inclusive":true,"cpe23_uri":"cve5:c2fo:fast-csv:< 4.3.6:< 4.3.6"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lgtm.com/query/8609731774537641779/","source_type":"MISC","tags":[]},{"url":"https://github.com/C2FO/fast-csv/issues/540","source_type":"MISC","tags":[]},{"url":"https://github.com/C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829e","source_type":"PATCH","tags":["patch"]},{"url":"https://www.npmjs.com/package/%40fast-csv/parse","source_type":"MISC","tags":[]},{"url":"https://www.npmjs.com/package/fast-csv","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2020-12-08T21:45:19Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:03:22.292184Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:03:22.292184Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:03:22.292184Z","label":"CVSS score revised","source":"cvelistv5"}]}