CVE-2026-85063
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.
What this means for your business
- FIRST's prediction model gives it a 0.6% chance of attack attempts being seen in the next 30 days, ranking above 44% of all known flaws.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
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Scoring
- CVSS
- Not yet scored
- CVSS v4
- 6.9
- Weakness
- CWE-1321
- Assigned by
- security-advisories@github.com
Dates
- Published
- 2026-09-03
- Last modified
- 2026-09-09
- Sources
- NVD