{"id":"CVE-2018-20164","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.)","aliases":["GHSA-fx7m-j728-mjw3"],"modified":"2026-07-08T16:40:34.772032Z","published":"2019-02-13T14:29:00.240Z","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/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ua-parser/uap-core","events":[{"introduced":"0"},{"fixed":"010ccdc7303546cd22b9da687c29f4a996990014"},{"fixed":"156f7e12b215bddbaf3df4514c399d683e6cdadc"}],"database_specific":{"cpe":"cpe:2.3:a:uaparser:user_agent_parser-core:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.6.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v0.3.4","php-3.3","java-1.3.0","java-1.2.2","v0.3.2","v0.3.1","v0.3.0","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.1.1","v0.1.0","semver"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20164.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}