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Vulnerability record · CVE-2019-11324 · published 18 April 2019

CVE-2019-11324: Python urllib3 improper certificate validation vulnerability

Python · Urllib3

The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different from the OS store of CA certificates, which results in SSL connections succeeding in situations where a verification failure is the correct outcome. This is related to use of the ssl_context, ca_certs, or ca_certs_dir argument.

7.5 CVSS 3.0 High EPSS 2.8% · top 13.9% CWE-295 · Improper certificate validation
7.5CVSS 3.0 base score, v2 5.0
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different from the OS store of CA certificates, which results in SSL connections succeeding in situations where a verification failure is the correct outcome. This is related to use of the ssl_context, ca_certs, or ca_certs_dir argument.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html
http://www.openwall.com/lists/oss-security/2019/04/19/1 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:3335
https://access.redhat.com/errata/RHSA-2019:3590
https://github.com/urllib3/urllib3/compare/a6ec68a...1efadf4 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKGPJLVLVYCL4L4B4G5TIOT
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOSA2NT4DUQDBEIWE6O7KKD
https://usn.ubuntu.com/3990-1/ Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html
http://www.openwall.com/lists/oss-security/2019/04/19/1 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:3335
https://access.redhat.com/errata/RHSA-2019:3590
https://github.com/urllib3/urllib3/compare/a6ec68a...1efadf4 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKGPJLVLVYCL4L4B4G5TIOT
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOSA2NT4DUQDBEIWE6O7KKD
https://usn.ubuntu.com/3990-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-11324), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.