CVE-2021-29418: Netmask Project Netmask

Medium severity, CVSS 5.3. EPSS: 1.7% chance of exploitation in the next 30 days.

The netmask package before 2.0.1 for Node.js mishandles certain unexpected characters in an IP address string, such as an octal digit of 9. This (in some situations) allows attackers to bypass access control that is based on IP addresses. NOTE: this issue exists because of an incomplete fix for CVE-2021-28918.

Affected products

• Netmask Project Netmask: before 2.0.1 (fixed in 2.0.1)

Published 2021-03-30. Last modified 2026-06-17.