{"id":"USN-5200-1","summary":"python3.7, python3.8 vulnerabilities","details":"\nIt was discovered that the urllib.request.AbstractBasicAuthHandler class \nin Python contains regex allowing for catastrophic backtracking. Specially \ncrafted traffic from a malicious HTTP server could cause a regular expression \ndenial of service (ReDoS) condition for a client.\n(CVE-2020-8492)\n\nIt was discovered that the urllib.request.AbstractBasicAuthHandler class \nin Python contains regex with a quadratic worst-case time complexity. \nSpecially crafted traffic from a malicious HTTP server could cause a regular \nexpression denial of service (ReDoS) condition for a client.\n(CVE-2021-3733)\n\nIt was discovered that the Python urllib http client could enter into an infinite \nloop when incorrectly handling certain server responses (100 Continue response). \nSpecially crafted traffic from a malicious HTTP server could cause a denial of \nservice (DoS) condition for a client.\n(CVE-2021-3737)\n\n","modified":"2026-02-10T04:42:24Z","published":"2021-12-17T14:59:29Z","related":["UBUNTU-CVE-2020-8492","UBUNTU-CVE-2021-3733","UBUNTU-CVE-2021-3737"],"upstream":["CVE-2020-8492","CVE-2021-3733","CVE-2021-3737","UBUNTU-CVE-2020-8492","UBUNTU-CVE-2021-3733","UBUNTU-CVE-2021-3737"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5200-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-8492"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3733"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3737"}],"affected":[{"package":{"name":"python3.7","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python3.7@3.7.5-2ubuntu1~18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.5-2ubuntu1~18.04.2"}]}],"versions":["3.7.0~a2-1","3.7.0~a3-1","3.7.0~a3-2","3.7.0~a3-3","3.7.0~a4-1","3.7.0~b1-1","3.7.0~b1-1build1","3.7.0~b2-1","3.7.0~b3-1","3.7.0-1~18.04","3.7.1-1~18.04","3.7.3-2~18.04.1","3.7.5-2~18.04","3.7.5-2~18.04.4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"idle-python3.7","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"libpython3.7","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"libpython3.7-dev","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"libpython3.7-minimal","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"libpython3.7-stdlib","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"libpython3.7-testsuite","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"python3.7","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"python3.7-dev","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"python3.7-examples","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"python3.7-minimal","binary_version":"3.7.5-2ubuntu1~18.04.2"},{"binary_name":"python3.7-venv","binary_version":"3.7.5-2ubuntu1~18.04.2"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2020-8492"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-3733"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-3737"}],"ecosystem":"Ubuntu:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5200-1.json"}},{"package":{"name":"python3.8","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python3.8@3.8.0-3ubuntu1~18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.0-3ubuntu1~18.04.2"}]}],"versions":["3.8.0-3~18.04","3.8.0-3~18.04.1"],"ecosystem_specific":{"availability":"No 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