AIKIDO-2026-149515
csv-parse is vulnerable to Prototype Pollution
58
Medium Risk
This Affects:
csv-parseTL;DR
csv-parse builds record objects from CSV header names when the columns option is enabled. With group_columns_by_name also enabled, a duplicated header such as __proto__ reaches the duplicate-column branch, which assigns an array to obj['__proto__'] and invokes the prototype setter, replacing the parsed record's prototype with input-controlled data. Before the fix this let untrusted CSV header rows replace or pollute the record prototype. The fix uses Object.hasOwn for the duplicate check and Object.defineProperty for assignment so a __proto__ column becomes an ordinary own property.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you parse untrusted CSV input with both the columns and group_columns_by_name options enabled.
Background info
csv-parse is vulnerable to Prototype Pollution in versions 0.0.1 - 7.0.1.
How to fix this
Upgrade the csv-parse library to the patch version.
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