The random_password_generator (aka RandomPasswordGenerator) gem through 1.0.0 for Ruby uses Kernel#rand to generate passwords, which, due to its cyclic nature, can facilitate password prediction.
https://ruby-doc.org/core-3.1.2/Random.html
https://github.com/bvsatyaram/random_password_generator/pull/1
https://github.com/bvsatyaram/random_password_generator/blob/2855e8d7d8803dbb580ddd6cf13846394eb4530e/lib/random_password_generator.rb#L23
https://stackoverflow.com/questions/42170239/security-of-rand-in-ruby-compared-to-other-methods/42170560
Source: Mitre, NVD
Published: 2022-05-18
Updated: 2026-06-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Severity: Medium
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity: High
EPSS: 0.00898