{"id":"UBUNTU-CVE-2020-26116","details":"http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of HTTPConnection.request.","modified":"2026-04-22T14:16:24.043061Z","published":"2020-09-27T04:15:00Z","related":["USN-4581-1","USN-4754-3","USN-6891-1"],"upstream":["CVE-2020-26116"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-26116"},{"type":"REPORT","url":"https://python-security.readthedocs.io/vuln/http-header-injection-method.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4581-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4754-3"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-26116"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6891-1"}],"affected":[{"package":{"name":"python3.4","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python3.4@3.4.3-1ubuntu1~14.04.7+esm8?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.3-1ubuntu1~14.04.7+esm8"}]}],"versions":["3.4~b1-0ubuntu3","3.4~b1-4ubuntu4","3.4~b1-4ubuntu6","3.4~b1-5ubuntu2","3.4~b2-1","3.4~b3-1ubuntu1","3.4~rc1-1build1","3.4~rc2-1","3.4~rc3-0ubuntu1","3.4.0-1","3.4.0-2ubuntu1","3.4.0-2ubuntu1.1","3.4.3-1ubuntu1~14.04.1","3.4.3-1ubuntu1~14.04.3","3.4.3-1ubuntu1~14.04.4","3.4.3-1ubuntu1~14.04.5","3.4.3-1ubuntu1~14.04.6","3.4.3-1ubuntu1~14.04.7","3.4.3-1ubuntu1~14.04.7+esm2","3.4.3-1ubuntu1~14.04.7+esm4","3.4.3-1ubuntu1~14.04.7+esm6","3.4.3-1ubuntu1~14.04.7+esm7"],"ecosystem_specific":{"binaries":[{"binary_name":"idle-python3.4","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_name":"libpython3.4","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_name":"libpython3.4-minimal","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_name":"libpython3.4-stdlib","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_name":"libpython3.4-testsuite","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_version":"3.4.3-1ubuntu1~14.04.7+esm8","binary_name":"python3.4"},{"binary_name":"python3.4-examples","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_name":"python3.4-minimal","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"},{"binary_name":"python3.4-venv","binary_version":"3.4.3-1ubuntu1~14.04.7+esm8"}],"availability":"Available 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