CVE-2020-26256 Explained : Impact and Mitigation

Fast-csv npm package before version 4.3.6 is vulnerable to a ReDoS issue when using the ignoreEmpty option during parsing.

Understanding CVE-2020-26256

Fast-csv npm package is susceptible to a Regular Expression Denial of Service (ReDoS) vulnerability.

What is CVE-2020-26256?

Fast-csv, a tool for parsing and formatting CSV files in node, has a vulnerability in versions prior to 4.3.6 when utilizing the ignoreEmpty option during parsing.

The Impact of CVE-2020-26256

The vulnerability can lead to a Denial of Service (DoS) attack, potentially causing high availability impact.

Technical Details of CVE-2020-26256

Fast-csv's vulnerability details and affected systems.

Vulnerability Description

Fast-csv npm package versions before 4.3.6 are prone to a ReDoS vulnerability when using the ignoreEmpty option during parsing.

Affected Systems and Versions

Product: fast-csv
Vendor: C2FO
Vulnerable Versions: < 4.3.6

Exploitation Mechanism

The vulnerability arises when the ignoreEmpty option is used during parsing, triggering a ReDoS attack.

Mitigation and Prevention

Protective measures and steps to address CVE-2020-26256.

Immediate Steps to Take

Upgrade fast-csv to version 4.3.6 or later to mitigate the vulnerability.

Long-Term Security Practices

Avoid using the ignoreEmpty option if possible to reduce the risk of ReDoS attacks.
Regularly update dependencies to ensure the latest security patches are applied.

Patching and Updates

Stay informed about security advisories and promptly apply patches to secure your systems.