{"id":"USN-5199-1","summary":"python3.6 vulnerabilities","details":"\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":"2021-12-17T14:53:00Z","related":["UBUNTU-CVE-2021-3733","UBUNTU-CVE-2021-3737"],"upstream":["CVE-2021-3733","CVE-2021-3737","UBUNTU-CVE-2021-3733","UBUNTU-CVE-2021-3737"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5199-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3733"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3737"}],"affected":[{"package":{"name":"python3.6","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python3.6@3.6.9-1~18.04ubuntu1.6?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.9-1~18.04ubuntu1.6"}]}],"versions":["3.6.3-1ubuntu1","3.6.4~rc1-1","3.6.4~rc1-2","3.6.4-1","3.6.4-2","3.6.4-3build1","3.6.4-4","3.6.5~rc1-1","3.6.5-3","3.6.6-1~18.04","3.6.7-1~18.04","3.6.8-1~18.04.1","3.6.8-1~18.04.2","3.6.8-1~18.04.3","3.6.9-1~18.04","3.6.9-1~18.04ubuntu1","3.6.9-1~18.04ubuntu1.1","3.6.9-1~18.04ubuntu1.3","3.6.9-1~18.04ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"idle-python3.6"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"libpython3.6"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"libpython3.6-dev"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"libpython3.6-minimal"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"libpython3.6-stdlib"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"libpython3.6-testsuite"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"python3.6"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"python3.6-dev"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"python3.6-examples"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"python3.6-minimal"},{"binary_version":"3.6.9-1~18.04ubuntu1.6","binary_name":"python3.6-venv"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5199-1.json","cves_map":{"cves":[{"id":"CVE-2021-3733","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-2021-3737","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"}]}],"ecosystem":"Ubuntu:18.04:LTS"}}}],"schema_version":"1.7.3"}