{"id":"CVE-2019-18348","title":"An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0","summary":"An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen …","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-74"],"vendor":"python","product":"python","affected":["python >= 2.0, <= 2.7.17","python >= 3.0, < 3.5.10","python >= 3.6.0, < 3.6.11","python >= 3.7.0, < 3.7.8","python >= 3.8.0, < 3.8.3"],"patched":["python 3.8.3"],"published":"2019-10-23","updated":"2026-10-07","sourceUpdated":"2026-10-07T19:17:13.663","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2019-18348","references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00041.html","label":"cve@mitre.org"},{"url":"https://bugs.python.org/issue30458#msg347282","label":"cve@mitre.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1727276","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20191107-0004/","label":"cve@mitre.org"},{"url":"https://usn.ubuntu.com/4333-1/","label":"cve@mitre.org"},{"url":"https://usn.ubuntu.com/4333-2/","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","label":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00041.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.python.org/issue30458#msg347282","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1727276","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20191107-0004/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4333-1/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4333-2/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"epss":0.03513,"epssPercentile":0.88861,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-07T18:00:08.130814Z"},"scores":{"nvd":6.1,"adp":5.4},"ingestedAt":"2026-10-07T18:42:20.910Z","slug":"CVE-2019-18348","body":"## Overview\n\nAn issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \\r\\n (specifically in the host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.). This is fixed in: v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1; v3.6.11, v3.6.11rc1, v3.6.12; v3.7.8, v3.7.8rc1, v3.7.9; v3.8.3, v3.8.3rc1, v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1.\n\n## Affected\n\n- `python >= 2.0, <= 2.7.17`\n- `python >= 3.0, < 3.5.10`\n- `python >= 3.6.0, < 3.6.11`\n- `python >= 3.7.0, < 3.7.8`\n- `python >= 3.8.0, < 3.8.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `python 3.8.3`","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0.7,"exploitation":0,"ransomware":0},"changes":[{"seq":217672,"id":"CVE-2019-18348","ts":1791402295514,"field":"cvss","old":"5.4","new":"6.1"}]}