{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9d75b033d7d00c4e1baa9b0afb4828faa8bd6602"
            }
          ],
          "repo": "https://github.com/crmne/ruby_llm",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67991.json"
  },
  "details": "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.",
  "id": "CVE-2026-67991",
  "modified": "2026-09-06T03:30:27.346235708Z",
  "published": "2026-08-13T00:00:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gist.github.com/Zykis1024/9f2d68fa3fd4e3a0ab83063bbe61a8e2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/crmne/ruby_llm/blob/fa6f279847d6d7027814539d9c0dfc3bbdfd2a83/lib/ruby_llm/utils.rb#L13"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67991.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67991"
    },
    {
      "type": "FIX",
      "url": "https://github.com/crmne/ruby_llm/commit/9d75b033d7d00c4e1baa9b0afb4828faa8bd6602"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/crmne/ruby_llm"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}