{"id":"CVE-2020-8492","details":"Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.","aliases":["BIT-libpython-2020-8492","BIT-python-2020-8492","BIT-python-min-2020-8492","PSF-2020-8"],"modified":"2026-04-16T04:38:27.859242594Z","published":"2020-01-30T19:15:12.103Z","related":["ALSA-2020:4641","SUSE-FU-2022:0444-1","SUSE-FU-2022:0445-1","SUSE-SU-2020:0467-1","SUSE-SU-2020:0510-1","SUSE-SU-2020:0557-1","SUSE-SU-2020:0854-1","SUSE-SU-2020:14306-1","SUSE-SU-2020:1524-1","SUSE-SU-2020:3563-1","SUSE-SU-2020:3865-1","SUSE-SU-2020:3930-1","SUSE-SU-2022:4281-1","openSUSE-SU-2020:0274-1","openSUSE-SU-2020:2332-1","openSUSE-SU-2020:2333-1","openSUSE-SU-2024:11202-1","openSUSE-SU-2024:11283-1","openSUSE-SU-2024:11284-1","openSUSE-SU-2024:11285-1","openSUSE-SU-2024:11286-1","openSUSE-SU-2024:12089-1","openSUSE-SU-2024:12910-1","openSUSE-SU-2024:14109-1","openSUSE-SU-2024:14434-1","openSUSE-SU-2025:15713-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da%40%3Ccommits.cassandra.apache.org%3E"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5%40%3Ccommits.cassandra.apache.org%3E"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20200221-0001/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202005-09"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4333-2/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4333-1/"},{"type":"REPORT","url":"https://bugs.python.org/issue39503"},{"type":"FIX","url":"https://github.com/python/cpython/pull/18284"},{"type":"EVIDENCE","url":"https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"last_affected":"c2f86d86e6c8f5fd1ef602128b537a48f3f5c063"},{"introduced":"2e789a1f1d84b343a996e8654590703b5fbdd441"},{"last_affected":"e5f6aba872e66bfd86eb592214696a519cded197"},{"introduced":"5c4568a05a0a62b5947c55f68f9f2ecfb90a4f12"},{"last_affected":"02dff8b01100e7cd6d4c93be27202ccb4ea05811"},{"introduced":"1bf9cc509326bc42cd8cb1650eb9bf64550d817e"},{"last_affected":"43364a7ae01fbe4288ef42622259a0038ce1edcc"},{"introduced":"fa919fdf2583bdfead1df00e842f24f30b2a34bf"},{"last_affected":"1b293b60067f6f4a95984d064ce0f6b6d34c1216"}],"database_specific":{"versions":[{"introduced":"2.7.0"},{"last_affected":"2.7.17"},{"introduced":"3.5.0"},{"last_affected":"3.5.9"},{"introduced":"3.6.0"},{"last_affected":"3.6.10"},{"introduced":"3.7.0"},{"last_affected":"3.7.6"},{"introduced":"3.8.0"},{"last_affected":"3.8.1"}]}}],"versions":["v0.9.8","v0.9.9","v1.0.1","v1.0.2","v1.1","v1.1.1","v1.2","v1.2b1","v1.2b2","v1.2b3","v1.2b4","v1.3","v1.3b1","v1.4","v1.4b1","v1.4b2","v1.4b3","v1.5","v1.5.1","v1.5.2","v1.5.2a1","v1.5.2a2","v1.5.2b1","v1.5.2b2","v1.5.2c1","v1.5a1","v1.5a2","v1.5a3","v1.5a4","v1.5b1","v1.5b2","v1.6a1","v1.6a2","v2.0","v2.0b1","v2.0b2","v2.0c1","v2.1","v2.1a1","v2.1a2","v2.1b1","v2.1b2","v2.1c1","v2.1c2","v2.2a3","v2.3c1","v2.3c2","v2.4","v2.4a1","v2.4a2","v2.4a3","v2.4b1","v2.4b2","v2.4c1","v2.5a0","v2.5a1","v2.5a2","v2.5b1","v2.5b2","v2.5b3","v2.6","v2.6a1","v2.6a2","v2.6a3","v2.6b1","v2.6b2","v2.6b3","v2.6rc1","v2.6rc2","v2.7","v2.7.1","v2.7.10rc1","v2.7.11rc1","v2.7.12rc1","v2.7.13rc1","v2.7.15rc1","v2.7.16rc1","v2.7.17","v2.7.17rc1","v2.7.1rc1","v2.7.2rc1","v2.7.3rc1","v2.7.4rc1","v2.7.5","v2.7.6rc1","v2.7.8","v2.7.9rc1","v2.7a1","v2.7a2","v2.7a3","v2.7a4","v2.7b1","v2.7b2","v2.7rc1","v2.7rc2","v3.0a1","v3.0a2","v3.0a3","v3.0a4","v3.0a5","v3.0b1","v3.0b2","v3.0b3","v3.0rc1","v3.0rc2","v3.0rc3","v3.1","v3.1a1","v3.1a2","v3.1b1","v3.1rc1","v3.1rc2","v3.2a1","v3.2a2","v3.2a3","v3.2a4","v3.2b1","v3.2b2","v3.2rc1","v3.2rc2","v3.2rc3","v3.3.0a2","v3.3.0a3","v3.3.0a4","v3.3.0b1","v3.3.0b2","v3.3.0rc1","v3.3.0rc2","v3.3.0rc3","v3.4.0a1","v3.4.0a2","v3.4.0a3","v3.4.0a4","v3.4.0b1","v3.4.0b2","v3.4.0b3","v3.5.0a1","v3.5.0a2","v3.5.0a3","v3.5.0a4","v3.5.0b1","v3.5.0b3","v3.5.0b4","v3.5.0rc1","v3.5.0rc2","v3.5.0rc3","v3.5.1rc1","v3.5.2","v3.5.2rc1","v3.5.3","v3.5.3rc1","v3.5.4","v3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