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...

GHSA-8CW4-87C7-C6XX 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 (csv-parse) versions prior to 7.0.2 are vulnerable to a prototype replacement issue when the columns and group_columns_by_name options are enabled. In packages/csv-parse/lib/api/index.js, a duplicate __proto__ header in a CSV file is treated as an existing property, allowing an attacker-...