#VU124271 Incorrect Regular Expression in Ruby on Rails - CVE-2026-33169
Published: March 24, 2026
Vulnerability identifier: #VU124271
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33169
CWE-ID: CWE-185
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Ruby on Rails
Ruby on Rails
Software vendor:
Rails
Rails
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient input validation when processing regular expressions within number_to_delimited in Active Support. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.
Remediation
Install updates from vendor's website.