AUGUST 15, 2026
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Case File

CVE-2026-67991

HIGH · CVSS 7.5 EPSS 0.36% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-13 · Last synced 2026-08-15

CyberRota Analysis

AI-Generated

The vulnerability affects the RubyLLM library, specifically in the `underscore` method, which can be exploited by providing a long, crafted class, agent, or tool name. This leads to excessive CPU consumption, resulting in a denial-of-service condition on systems running Ruby 3.1.x. Organizations utilizing this library should prioritize patching to mitigate the risk of service disruption.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-67991
Severity
HIGH
CVSS
7.5
EPSS
0.36%

Original NVD Description

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.