CVE-2026-67991

HIGH CVSS 3.1: 7.5
Updated Aug 13, 2026
Ruby
Parameter Value
CVSS 7.5 (HIGH)
Type CWE-1333 (Inefficient Regular Expression Complexity / ReDoS)
Vendor Ruby
Public PoC No

crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains a polynomial-time regular expression denial-of-service condition in RubyLLM::Utils.underscore on Ruby 3.1.x. A very long crafted class, agent, or tool name can cause excessive CPU consumption and a denial of service.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products

n/a:n/a