{"id":"CVE-2019-9636","state":"PUBLISHED","title":"Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Informa","description":"Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, 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; v3.7.3, v3.7.3rc1, 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":"2019-03-08T21:00:00.000Z","updatedAt":"2026-10-14T06:49:39.823Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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/107400","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L25RTMKCF62DLC2XVSNXGX7C7HXISLVM/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGOOUIDE4RRB/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D3LXPABKVLFYUHRYJPM3CSS5MS6FXKS7/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWYGKO7YU3NJ/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ICBEGRHIPHWPG2VGYS6R4EVKVUUF4AQW/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TR6GCO3WTV4D5L23WTCBF275VE6BVNI3/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEEFYBVEXHCK/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CFBAAGM27H73OLYBUA2IAZFSUN6KGLME/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IFAXBEY2TGOBDRKTR556JBXBVFSAKD6I/","https://access.redhat.com/errata/RHSA-2019:0710","https://access.redhat.com/errata/RHSA-2019:0765","https://access.redhat.com/errata/RHSA-2019:0806","http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00092.html","http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00097.html","https://access.redhat.com/errata/RHSA-2019:0902","https://access.redhat.com/errata/RHSA-2019:0981","https://access.redhat.com/errata/RHSA-2019:0997","https://access.redhat.com/errata/RHBA-2019:0959","http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00024.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/","https://access.redhat.com/errata/RHSA-2019:1467","http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00050.html","https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html","https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html","https://access.redhat.com/errata/RHBA-2019:0764","https://access.redhat.com/errata/RHBA-2019:0763","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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KRYFIMISZ47NTAU3XWZUOFB7CYL62KES/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQEQLXLOCR3SNM3AA5RRYJFQ5AZBYJ4L/","http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00042.html","https://usn.ubuntu.com/4127-2/","https://usn.ubuntu.com/4127-1/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ER6LONC2B2WYIO56GBQUDU6QTWZDPUNQ/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E2HP37NUVLQSBW3J735A2DQDOZ4ZGBLY/","https://access.redhat.com/errata/RHSA-2019:2980","https://access.redhat.com/errata/RHSA-2019:3170","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/","http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html","https://security.gentoo.org/glsa/202003-26","https://www.oracle.com/security-alerts/cpujan2020.html","https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html","https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html","https://www.oracle.com/security-alerts/cpujul2022.html","https://github.com/python/cpython/pull/12201","https://python-security.readthedocs.io/vuln/urlsplit-nfkc-normalization.html","https://bugs.python.org/issue36216","https://security.netapp.com/advisory/ntap-20190517-0001/","https://cert-portal.siemens.com/productcert/html/ssa-398330.html"],"weaknesses":["CWE-173"],"ingestedAt":"2026-10-29T19:46:15.253Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2019/9xxx/CVE-2019-9636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2019-9636","state":"PUBLISHED","datePublished":"2019-03-08T21:00:00.000Z","dateUpdated":"2026-10-14T06:49:39.823Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2019-03-08T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, 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; v3.7.3, v3.7.3rc1, 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/107400","name":"107400","tags":["vdb-entry","x_refsource_BID"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L25RTMKCF62DLC2XVSNXGX7C7HXISLVM/","name":"FEDORA-2019-243442e600","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGOOUIDE4RRB/","name":"FEDORA-2019-6e1938a3c5","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D3LXPABKVLFYUHRYJPM3CSS5MS6FXKS7/","name":"FEDORA-2019-6baeb15da3","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWYGKO7YU3NJ/","name":"FEDORA-2019-cf725dd20b","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ICBEGRHIPHWPG2VGYS6R4EVKVUUF4AQW/","name":"FEDORA-2019-6b02154aa0","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TR6GCO3WTV4D5L23WTCBF275VE6BVNI3/","name":"FEDORA-2019-7d9f3cf3ce","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEEFYBVEXHCK/","name":"FEDORA-2019-51f1e08207","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CFBAAGM27H73OLYBUA2IAZFSUN6KGLME/","name":"FEDORA-2019-a122fe704d","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IFAXBEY2TGOBDRKTR556JBXBVFSAKD6I/","name":"FEDORA-2019-86f32cbab1","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0710","name":"RHSA-2019:0710","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0765","name":"RHSA-2019:0765","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0806","name":"RHSA-2019:0806","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00092.html","name":"openSUSE-SU-2019:1273","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00097.html","name":"openSUSE-SU-2019:1282","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0902","name":"RHSA-2019:0902","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0981","name":"RHSA-2019:0981","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:0997","name":"RHSA-2019:0997","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHBA-2019:0959","name":"RHBA-2019:0959","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00024.html","name":"openSUSE-SU-2019:1371","tags":["vendor-advisory","x_refsource_SUSE"]},{"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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/","name":"FEDORA-2019-ec26883852","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://access.redhat.com/errata/RHSA-2019:1467","name":"RHSA-2019:1467","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00050.html","name":"openSUSE-SU-2019:1580","tags":["vendor-advisory","x_refsource_SUSE"]},{"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 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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 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2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, 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; v3.7.3, v3.7.3rc1, 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":"107400","refsource":"BID","url":"http://www.securityfocus.com/bid/107400"},{"name":"FEDORA-2019-243442e600","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L25RTMKCF62DLC2XVSNXGX7C7HXISLVM/"},{"name":"FEDORA-2019-6e1938a3c5","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGOOUIDE4RRB/"},{"name":"FEDORA-2019-6baeb15da3","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D3LXPABKVLFYUHRYJPM3CSS5MS6FXKS7/"},{"name":"FEDORA-2019-cf725dd20b","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWYGKO7YU3NJ/"},{"name":"FEDORA-2019-6b02154aa0","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ICBEGRHIPHWPG2VGYS6R4EVKVUUF4AQW/"},{"name":"FEDORA-2019-7d9f3cf3ce","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TR6GCO3WTV4D5L23WTCBF275VE6BVNI3/"},{"name":"FEDORA-2019-51f1e08207","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEEFYBVEXHCK/"},{"name":"FEDORA-2019-a122fe704d","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CFBAAGM27H73OLYBUA2IAZFSUN6KGLME/"},{"name":"FEDORA-2019-86f32cbab1","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IFAXBEY2TGOBDRKTR556JBXBVFSAKD6I/"},{"name":"RHSA-2019:0710","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:0710"},{"name":"RHSA-2019:0765","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:0765"},{"name":"RHSA-2019:0806","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:0806"},{"name":"openSUSE-SU-2019:1273","refsource":"SUSE","url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00092.html"},{"name":"openSUSE-SU-2019:1282","refsource":"SUSE","url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00097.html"},{"name":"RHSA-2019:0902","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:0902"},{"name":"RHSA-2019:0981","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:0981"},{"name":"RHSA-2019:0997","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:0997"},{"name":"RHBA-2019:0959","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHBA-2019:0959"},{"name":"openSUSE-SU-2019:1371","refsource":"SUSE","url":"http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00024.html"},{"name":"FEDORA-2019-1ffd6b6064","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/"},{"name":"FEDORA-2019-ec26883852","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/"},{"name":"RHSA-2019:1467","refsource":"REDHAT","url":"https://access.redhat.com/errata/RHSA-2019:1467"},{"name":"openSUSE-SU-2019:1580","refsource":"SUSE","url":"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00050.html"},{"name":"[debian-lts-announce] 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