{"id":"CVE-2018-20164","aliases":["GHSA-fx7m-j728-mjw3"],"url":"https://o3.security/vulnerability/CVE-2018-20164","summary":"uap-core Regular Expression Denial of Service issue","details":"An issue was discovered in regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The UAP-Core project contains the vulnerability, propagating to all implementations.)","published":"2019-02-13T14:29:00.240Z","modified":"2026-07-08T16:40:34.772032Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"uap-core","fixedVersion":"0.6.0"}],"fix":{"url":"https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014","label":"ua-parser/uap-core@010ccdc"},"references":[{"type":"REPORT","url":"https://github.com/ua-parser/uap-core/issues/332"},{"type":"FIX","url":"https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014"},{"type":"FIX","url":"https://github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadc"},{"type":"EVIDENCE","url":"https://www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T16:40:34.772032Z"}}