{"id":"CVE-2026-67991","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.","modified":"2026-09-06T03:47:04.799442954Z","published":"2026-08-13T00:00:00Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67991.json","cna_assigner":"mitre"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/crmne/ruby_llm","events":[{"introduced":"0"},{"fixed":"9d75b033d7d00c4e1baa9b0afb4828faa8bd6602"}],"database_specific":{"source":"REFERENCES"}}],"versions":["1.16.0","1.15.0","1.14.1","1.14.0","1.13.2","1.13.1","1.13.0","1.12.1","1.12.0","1.11.0","1.10.0","1.9.2","1.9.1","1.9.0","1.8.2","1.8.1","1.8.0","1.7.1","1.7.0","1.6.4","1.6.3","1.6.2","1.6.1","1.6.0","1.5.1","1.5.0","1.4.0","1.3.1","1.3.0","1.3.0rc1","1.2.0","1.1.2","1.1.1","1.1.0","1.1.0rc2","1.1.0rc1","1.0.1","1.0.0","0.1.0.pre42"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67991.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}