CVE-2020-26300: 
JavaScript vulnerability analysis and mitigation

CVE-2020-26300 affects systeminformation, an npm package that provides system and OS information library for node.js. The vulnerability was discovered in versions before 4.26.2 and involves a command injection vulnerability. The issue was fixed in version 4.26.2 with a shell string sanitation fix (NVD, GitHub Advisory).

The vulnerability exists in the si.services method which contains a command injection flaw. The issue allows attackers to execute arbitrary commands by passing specially crafted input to the affected method. The vulnerability has a CVSS v3.1 base score of 9.8 CRITICAL according to NVD assessment, while GitHub rates it as 5.9 MEDIUM. The vulnerability is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command (Security Lab, NVD).

If exploited, this vulnerability could lead to remote code execution if a client of the library calls the vulnerable method with untrusted input. This could allow attackers to execute arbitrary commands on the affected system (Security Lab).

The recommended mitigation is to upgrade to version 4.26.2 or later which includes the shell string sanitation fix. If upgrading is not possible, users should check or sanitize service parameter strings that are passed to si.services(), si.inetChecksite(), si.inetLatency(), si.networkStats(), and si.processLoad() methods (GitHub Advisory).