{"id":"CVE-2026-67987","aliases":["EUVD-2026-89427","GHSA-5m38-526f-3498","UBUNTU-CVE-2026-67987"],"status":"published","title":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time...","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00432,"percentile":0.37841,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1333"],"published":"2026-09-29T00:00:00Z","modified":"2026-10-28T02:30:36Z","affected":[{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ruby-llm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.0-2"]}],"references":[{"url":"https://github.com/crmne/ruby_llm","tags":["package","report"]},{"url":"https://github.com/crmne/ruby_llm/blob/fa6f279847d6d7027814539d9c0dfc3bbdfd2a83/lib/ruby_llm/protocols/chat_completions/chat.rb#L355-L356","tags":["web","report"]},{"url":"https://github.com/crmne/ruby_llm/commit/5e88411f171721b381853fa77d254e266dcf6ad8","tags":["fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67987","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5m38-526f-3498"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67987.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-67987","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67987","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-67987","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","status":"published","published":"2026-09-29T00:00:00Z","modified":"2026-10-01T15:22:56.624Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:20:06.562031Z"}],"euvd":[{"id":"EUVD-2026-89427","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","status":"published","published":"2026-09-29T00:00:00Z","modified":"2026-10-01T15:22:56Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:27:44.672309Z"}],"ghsa":[{"id":"GHSA-5m38-526f-3498","title":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time...","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","status":"published","published":"2026-09-29T21:33:25Z","modified":"2026-10-01T18:33:47Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:12:41.196374Z"}],"nvd":[{"id":"CVE-2026-67987","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","status":"published","published":"2026-09-29T20:17:22.97Z","modified":"2026-10-01T16:17:47.723Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:12:52.759595Z"}],"osv":[{"id":"CVE-2026-67987","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","status":"published","published":"2026-09-29T00:00:00Z","modified":"2026-10-28T02:30:36.625412921Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:14.46177Z"},{"id":"UBUNTU-CVE-2026-67987","description":"crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated \u003cthink\u003e tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing","status":"published","published":"2026-09-29T20:17:00Z","modified":"2026-10-17T13:00:40.031370956Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:53.710209Z"}]}}