CSV Injection Affecting json-2-csv package, versions >=3.15.0 <5.5.11
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-JSON2CSV-14221326
- published27 May 2026
- disclosed6 Dec 2025
- creditIlsaf Nabiullin
Introduced: 6 Dec 2025
CVE-2026-9673 (opens in a new tab)How to fix?
Upgrade json-2-csv to version 5.5.11 or higher.
Overview
json-2-csv is an A JSON to CSV and CSV to JSON converter that natively supports sub-documents and auto-generates the CSV heading.
Affected versions of this package are vulnerable to CSV Injection via the preventCsvInjection option which can be bypassed. An attacker can inject formulas into CSV files, which execute when the files are opened in spreadsheet applications.
PoC
const { json2csv } = require('json-2-csv');
const data = [
{ name: 'Alice', value: '100' },
{ name: 'Bob', value: '200' },
{ name: 'Total', value: ' =SUM(B1:B2)' } // 3 spaces before =
];
const csv = json2csv(data, { preventCsvInjection: true });
console.log(csv);