CVE-2026-67991CWE-1333

CVE-2026-67991

High · published August 13, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
42.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00508 · 42.5th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2026-08-13T18:17Z
References (4)
https://gist.github.com/Zykis1024/9f2d68fa3fd4e3a0ab83063bbe61a8e2 · [email protected]https://github.com/crmne/ruby_llm · [email protected]https://github.com/crmne/ruby_llm/blob/fa6f279847d6d7027814539d9c0dfc3bbdfd2a83/lib/ruby_llm/utils.rb#L13 · [email protected]https://github.com/crmne/ruby_llm/commit/9d75b033d7d00c4e1baa9b0afb4828faa8bd6602 · [email protected]
EPSS history
Timeline
  • 13 AUG 00:00Z
    crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains a polynomial-time regular expression denial-of-service condition in…
    cvelistv5