CVE-2018-1000807: Canonical Ubuntu Linux

High severity, CVSS 8.1. EPSS: 4.1% chance of exploitation in the next 30 days.

Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.

Affected products

• Canonical Ubuntu Linux: version 16.04 only
• Pyopenssl Pyopenssl: before 17.5.0 (fixed in 17.5.0)
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Red Hat Openstack: version 13 only

Published 2018-10-08. Last modified 2026-06-17.