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Vulnerability record · CVE-2019-5010 · published 31 October 2019

CVE-2019-5010: Python null pointer dereference vulnerability

Python · Python

An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.6. A specially crafted X509 certificate can cause a NULL pointer dereference, resulting in a denial of service. An attacker can initiate or accept TLS connections using crafted certificates to trigger this vulnerability.

7.5 CVSS 3.1 High EPSS 21% · top 2.5% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.6. A specially crafted X509 certificate can cause a NULL pointer dereference, resulting in a denial of service. An attacker can initiate or accept TLS connections using crafted certificates to trigger this vulnerability.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:3520 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3725 Third Party Advisory
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.ap
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202003-26 Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0758 ExploitThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:3520 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3725 Third Party Advisory
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.ap
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202003-26 Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0758 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-5010), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.