The vulnerability identified as CVE-2026-67989 exists in the crmne/ruby_llm repository at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83. It involves a polynomial-time regular expression denial-of-service (ReDoS) condition affecting the Mistral model capability matching functionality when running on Ruby version 3.1.x. This flaw allows an attacker to cause excessive CPU consumption by exploiting the inefficient regular expression, potentially leading to denial of service.

Exploitation of this vulnerability can cause significant CPU resource exhaustion due to the polynomial-time complexity of the regular expression, resulting in denial of service or degraded performance of applications using the affected code on Ruby 3.1.x. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is currently available. Users should monitor for updates from the maintainers of crmne/ruby_llm and apply any future patches addressing this issue. Until a fix is available, consider limiting exposure to untrusted input that triggers the Mistral model capability matching or applying runtime mitigations if feasible.