{"cve":"CVE-2026-85063","nvd":{"published":"2026-09-03T21:17:23.620","modified":"2026-09-09T21:09:13.080","status":"Deferred","description":"node-csv is a full-featured CSV parser with a simple API that is tested against large datasets. Prior to 7.0.2, csv-parse with the columns and group_columns_by_name options enabled treats a duplicate __proto__ header as an existing property in packages/csv-parse/lib/api/index.js, assigns an attacker-controlled array through obj['__proto__'], and replaces the parsed record object's prototype. A malicious CSV header can therefore inject inherited array values into the returned record, hide those inherited values from JSON serialization, and affect property enumeration and type or shape checks in applications that process the record. This issue is fixed in version 7.0.2.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","score":6.9},"cvss_v3":null,"cwes":["CWE-1321"],"references":["https://github.com/adaltas/node-csv/commit/eb4d1484589c976dcb977db8dd0b90e015a6f66e","https://github.com/adaltas/node-csv/issues/496","https://github.com/adaltas/node-csv/pull/497","https://github.com/adaltas/node-csv/security/advisories/GHSA-8cw4-87c7-c6xx","https://github.com/adaltas/node-csv/issues/496"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-85063","score":0.00566,"percentile":0.46974,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8cw4-87c7-c6xx","url":"https://osv.dev/vulnerability/GHSA-8cw4-87c7-c6xx","summary":"node-csv: Prototype replacement still reachable via columns path","modified":"2026-09-08T18:15:03.989241486Z","packages":[{"ecosystem":"npm","name":"csv-parse","purl":"pkg:npm/csv-parse","ranges":["<7.0.2"],"fixed":["7.0.2"]}]}],"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."]}