All the vulnerabilities related to the version 3.4.0 of the package
Bootstrap Vulnerable to Cross-Site Scripting
Versions of bootstrap prior to 3.4.1 for 3.x and 4.3.1 for 4.x are vulnerable to Cross-Site Scripting (XSS). The data-template attribute of the tooltip and popover plugins lacks input sanitization and may allow attacker to execute arbitrary JavaScript.
For bootstrap 4.x upgrade to 4.3.1 or later.
For bootstrap 3.x upgrade to 3.4.1 or later.