{"id":"PSF-2020-8","summary":"urllib basic auth regex denial of service","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","CVE-2020-8492"],"modified":"2026-05-18T05:46:53.690576937Z","published":"2020-01-30T00:00:00Z","database_specific":{"cwe_ids":[]},"references":[{"type":"REPORT","url":"https://bugs.python.org/issue38826"},{"type":"WEB","url":"https://bugs.python.org/issue39503"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"0b297d4ff1c0e4480ad33acae793fbaf4bf015b4"},{"fixed":"37fe316479e0b6906a74b0c0a5e495c55037fdfd"},{"fixed":"69cdeeb93e0830004a495ed854022425b93b3f3e"},{"fixed":"b57a73694e26e8b2391731b5ee0b1be59437388e"},{"fixed":"ea9e240aa02372440be8024acb110371f69c9d41"}]}],"versions":["v3.7.7rc1","v3.9.0a2","v3.6.10","v3.6.10rc1","v3.7.6rc1","v3.5.9","v3.5.8","v3.5.8rc2","v3.5.8rc1","v3.8.0rc1","v3.6.9","v3.6.9rc1","v3.7.3rc1","v3.5.7","v3.5.7rc1","v3.6.8","v3.7.2rc1","v3.6.8rc1","v3.5.6","v3.5.6rc1","v3.7.0rc1","v3.6.6rc1","v3.7.0b5","v3.7.0b4","v3.7.0b3","v3.7.0b2","v3.5.5","v3.5.5rc1","v3.7.0b1","v3.7.0a2","v3.5.4","v3.5.4rc1","v3.6.2rc1","v3.5.3","v3.5.3rc1","v3.6.0rc1","v3.6.0b4","v3.6.0b3","v3.6.0b1","v3.6.0a3","v3.5.2","v3.5.2rc1","v3.5.1rc1","v3.5.0rc3","v3.5.0rc2","v3.5.0rc1","v3.5.0b4","v3.5.0b3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1.1","v1.0.2","v1.0.1","v0.9.9","v0.9.8"],"database_specific":{"source":"https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2020-8.json"}}],"schema_version":"1.7.5"}