CVE-2021-40895 : What You Need to Know

This CVE article provides details about a Regular Expression Denial of Service (ReDOS) vulnerability found in todo-regex v0.1.1.

Understanding CVE-2021-40895

This section delves into the nature and impact of the identified vulnerability.

What is CVE-2021-40895?

A ReDOS vulnerability was discovered in todo-regex v0.1.1 when processing malformed TODO statements.

The Impact of CVE-2021-40895

The flaw could be exploited by an attacker to cause a denial of service (DoS) by sending specially crafted input to the affected application.

Technical Details of CVE-2021-40895

Exploring the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability exists due to inefficient regex matching in the processing of invalid TODO statements.

Affected Systems and Versions

Affected Versions: todo-regex v0.1.1
Affected Products: N/A
Affected Vendor: N/A

Exploitation Mechanism

An attacker could exploit this vulnerability by sending crafted invalid TODO statements to the application, triggering excessive regex matching and leading to a DoS condition.

Mitigation and Prevention

Suggestions on addressing and preventing the exploitation of the CVE.

Immediate Steps to Take

Update todo-regex to the latest version.
Implement input validation to block malformed TODO statements.

Long-Term Security Practices

Regularly audit and update regex patterns used in applications.
Train developers on secure coding practices to avoid regex vulnerabilities.

Patching and Updates

Apply patches promptly and stay informed about security updates for the todo-regex library.