{"id":"CVE-2019-9740","state":"PUBLISHED","title":"An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demo","description":"An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. 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 query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.","publishedAt":"2019-03-13T03:00:00.000Z","updatedAt":"2026-10-14T06:49:42.941Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"CISA-ADP"},"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["http://www.securityfocus.com/bid/107466","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/","https://access.redhat.com/errata/RHSA-2019:1260","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/","https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html","https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html","https://lists.debian.org/debian-lts-announce/2019/06/msg00026.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/44TS66GJMO5H3RLMVZEBGEFTB6O2LJJU/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ORNTF62QPLMJXIQ7KTZQ2776LMIXEKL/","https://access.redhat.com/errata/RHSA-2019:2030","https://usn.ubuntu.com/4127-2/","http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html","http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html","https://usn.ubuntu.com/4127-1/","https://seclists.org/bugtraq/2019/Oct/29","https://access.redhat.com/errata/RHSA-2019:3335","https://access.redhat.com/errata/RHSA-2019:3520","https://access.redhat.com/errata/RHSA-2019:3725","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/","https://security.gentoo.org/glsa/202003-26","https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html","https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html","http://packetstormsecurity.com/files/154927/Slackware-Security-Advisory-python-Updates.html","http://www.openwall.com/lists/oss-security/2021/02/04/2","https://www.oracle.com/security-alerts/cpujul2022.html","https://bugs.python.org/issue36276","https://security.netapp.com/advisory/ntap-20190619-0005/","https://cert-portal.siemens.com/productcert/html/ssa-398330.html"],"weaknesses":["CWE-93"],"ingestedAt":"2026-10-29T19:46:15.253Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2019/9xxx/CVE-2019-9740.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2019-9740","state":"PUBLISHED","datePublished":"2019-03-13T03:00:00.000Z","dateUpdated":"2026-10-14T06:49:42.941Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2019-03-12T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. 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 query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"http://www.securityfocus.com/bid/107466","name":"107466","tags":["vdb-entry","x_refsource_BID"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/","name":"FEDORA-2019-1ffd6b6064","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://access.redhat.com/errata/RHSA-2019:1260","name":"RHSA-2019:1260","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/","name":"FEDORA-2019-ec26883852","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html","name":"[debian-lts-announce] 20190625 [SECURITY] [DLA 1834-1] python2.7 security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html","name":"[debian-lts-announce] 20190625 [SECURITY] [DLA 1835-1] python3.4 security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.debian.org/debian-lts-announce/2019/06/msg00026.html","name":"[debian-lts-announce] 20190625 [SECURITY] [DLA 1835-2] python3.4 regression update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/44TS66GJMO5H3RLMVZEBGEFTB6O2LJJU/","name":"FEDORA-2019-7723d4774a","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ORNTF62QPLMJXIQ7KTZQ2776LMIXEKL/","name":"FEDORA-2019-7df59302e0","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://access.redhat.com/errata/RHSA-2019:2030","name":"RHSA-2019:2030","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://usn.ubuntu.com/4127-2/","name":"USN-4127-2","tags":["vendor-advisory","x_refsource_UBUNTU"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html","name":"openSUSE-SU-2019:2131","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html","name":"openSUSE-SU-2019:2133","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"https://usn.ubuntu.com/4127-1/","name":"USN-4127-1","tags":["vendor-advisory","x_refsource_UBUNTU"]},{"url":"https://seclists.org/bugtraq/2019/Oct/29","name":"20191021 [slackware-security] python (SSA:2019-293-01)","tags":["mailing-list","x_refsource_BUGTRAQ"]},{"url":"https://access.redhat.com/errata/RHSA-2019:3335","name":"RHSA-2019:3335","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:3520","name":"RHSA-2019:3520","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:3725","name":"RHSA-2019:3725","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/","name":"FEDORA-2019-b06ec6159b","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/","name":"FEDORA-2019-d202cda4f8","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/","name":"FEDORA-2019-57462fa10d","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://security.gentoo.org/glsa/202003-26","name":"GLSA-202003-26","tags":["vendor-advisory","x_refsource_GENTOO"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html","name":"[debian-lts-announce] 20200715 [SECURITY] [DLA 2280-1] python3.5 security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html","name":"[debian-lts-announce] 20200822 [SECURITY] [DLA 2337-1] python2.7 security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"http://packetstormsecurity.com/files/154927/Slackware-Security-Advisory-python-Updates.html","tags":["x_refsource_MISC"]},{"url":"http://www.openwall.com/lists/oss-security/2021/02/04/2","name":"[oss-security] 20210204 [CVE-2020-15693, CVE-2020-15694] Nim - 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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 query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"107466","refsource":"BID","url":"http://www.securityfocus.com/bid/107466"},{"name":"FEDORA-2019-1ffd6b6064","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/"},{"name":"RHSA-2019:1260","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:1260"},{"name":"FEDORA-2019-ec26883852","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/"},{"name":"[debian-lts-announce] 20190625 [SECURITY] [DLA 1834-1] python2.7 security update","refsource":"MLIST","url":"https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html"},{"name":"[debian-lts-announce] 20190625 [SECURITY] [DLA 1835-1] python3.4 security 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