node-csv: Prototype replacement still reachable via columns path

Impact With columns: true and groupcolumnsbyname: true, a duplicated proto header causes the duplicate-column branch to assign an array to obj'proto', invoking the proto setter and replacing the parsed record object's prototype with attacker-controlled data. Fixed in 7.0.2 Object.hasOwn duplicate...

CVE-2026-85063 node-csv: Prototype replacement still reachable via columns path

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 groupcolumnsbyname options enabled treats a duplicate proto header as an existing property in packages/csv-parse/lib/api/index.js, assigns an...