{"id":"CVE-2026-71190","details":"In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtracking (ReDoS). The \"qdtext\" pattern (?:[^\"]|\\\\.)* allows an unauthenticated remote attacker to send a crafted Accept header that causes exponential CPU consumption in the proxy worker. A payload of 32 backslash-character pairs exceeds 30 seconds of CPU time. No authentication is required. Repeated requests can exhaust all proxy worker threads, resulting in a complete denial of service.","modified":"2026-09-11T03:30:49.162424519Z","published":"2026-08-05T04:54:03.020Z","database_specific":{"cna_assigner":"mitre","cwe_ids":["CWE-1333"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71190.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/05/19"},{"type":"WEB","url":"https://opendev.org/openstack/swift"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71190.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71190"},{"type":"ADVISORY","url":"https://openwall.com/lists/oss-security/2026/07/28/27"},{"type":"ADVISORY","url":"https://security.openstack.org/ossa/OSSA-2026-031.html"},{"type":"REPORT","url":"https://launchpad.net/bugs/2158771"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://opendev.org/openstack/swift","events":[{"introduced":"4bd9e4584d31eb37c7e30e555daeb6b90703ee3a"},{"fixed":"fc875f93e82edf98805d0eead3e3c961673c3ef8"},{"introduced":"82cb5a5d78b91c6af258cd8f06d30f69be90fa18"},{"fixed":"deaa3e4691bb19224f5ef57e7fbcd08b7eff5277"},{"introduced":"555026d200337b39c97eb9dafd26901ff40c7a1d"},{"fixed":"5104042f12efcaf90c28b656a378da8959004826"},{"introduced":"9f5881d5143fd06a328bde2713cd9c61df579289"},{"last_affected":"9f5881d5143fd06a328bde2713cd9c61df579289"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"1.9.1"},{"fixed":"2.35.4"},{"introduced":"2.36.0"},{"fixed":"2.36.3"},{"introduced":"2.37.0"},{"fixed":"2.37.3"},{"introduced":"2.38.0"},{"last_affected":"2.38.0"}]}}],"versions":["2.38.0","2.37.2","2.36.2","2.36.1","2.37.1","2.37.0","2.36.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71190.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}