CVE-2019-5010

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

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

21% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2019-10-31

Modified

2026-10-07

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• opensuse:leap
• python:python
• redhat:enterprise_linux
• redhat:enterprise_linux_eus
• redhat:enterprise_linux_server_aus
• redhat:enterprise_linux_server_tus

References

• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
• https://access.redhat.com/errata/RHSA-2019:3520
• https://access.redhat.com/errata/RHSA-2019:3725
• https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html

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