Is CVE-2019-9636 being actively exploited?

CVE-2019-9636 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2019-9636?

CVE-2019-9636 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2019-9636

CRITICAL · CVSS 9.8EPSS 7.7%EU EUVD

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.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-173
EPSS score: 7.7% (95th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2019-19005)
Published: March 8, 2019
NVD last modified: October 14, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2019-19005 in the EU Vulnerability Database. Last updated in EUVD on October 14, 2026.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
fedoraproject / fedora
fedoraproject / fedora
fedoraproject / fedora
fedoraproject / fedora
opensuse / leap
opensuse / leap
opensuse / leap
oracle / sun zfs storage appliance kit
python / python
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux desktop
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server eus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux workstation
redhat / openshift container platform
redhat / virtualization

Certified products that may be affected

33 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active
Red Hat Enterprise Linux 8.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11309-2024 - archived
Red Hat Enterprise Linux 8 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 4642 - historical

See all 33 in the Security Certifications Explorer.

References

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00092.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00097.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00024.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00050.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00042.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html(Mailing List, Third Party Advisory)
http://www.securityfocus.com/bid/107400(Third Party Advisory, VDB Entry)
https://access.redhat.com/errata/RHBA-2019:0763(Third Party Advisory)
https://access.redhat.com/errata/RHBA-2019:0764(Third Party Advisory)
https://access.redhat.com/errata/RHBA-2019:0959(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0710(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0765(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0806(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0902(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0981(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0997(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:1467(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:2980(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:3170(Third Party Advisory)
https://bugs.python.org/issue36216(Issue Tracking, Patch, Vendor Advisory)
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://github.com/python/cpython/pull/12201(Patch, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html(Mailing List, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html(Mailing List, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html(Mailing List, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html(Mailing List, Third Party Advisory)
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/44TS66GJMO5H3RLMVZEBGEFTB6O2LJJU/
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/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/
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/CFBAAGM27H73OLYBUA2IAZFSUN6KGLME/
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/E2HP37NUVLQSBW3J735A2DQDOZ4ZGBLY/
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/HQEQLXLOCR3SNM3AA5RRYJFQ5AZBYJ4L/
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/IFAXBEY2TGOBDRKTR556JBXBVFSAKD6I/
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/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/

Last updated October 15, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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