{"id":"BIT-libpython-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-python-2020-8492","BIT-python-min-2020-8492","CVE-2020-8492","PSF-2020-8"],"modified":"2025-08-11T15:13:31.298023Z","published":"2025-08-11T13:51:39.499Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html"},{"type":"WEB","url":"https://bugs.python.org/issue39503"},{"type":"WEB","url":"https://github.com/python/cpython/pull/18284"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5%40%3Ccommits.cassandra.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da%40%3Ccommits.cassandra.apache.org%3E"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html"},{"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/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8492"},{"type":"WEB","url":"https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202005-09"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20200221-0001/"},{"type":"WEB","url":"https://usn.ubuntu.com/4333-1/"},{"type":"WEB","url":"https://usn.ubuntu.com/4333-2/"}],"affected":[{"package":{"name":"libpython","ecosystem":"Bitnami","purl":"pkg:bitnami/libpython"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.7.0"},{"fixed":"2.7.18"},{"introduced":"3.5.0"},{"fixed":"3.5.10"},{"introduced":"3.6.0"},{"fixed":"3.6.11"},{"introduced":"3.7.0"},{"fixed":"3.7.7"},{"introduced":"3.8.0"},{"fixed":"3.8.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/libpython/BIT-libpython-2020-8492.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.7.3"}