CVE-2018-1000808: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 1.9% chance of exploitation in the next 30 days.

Python Cryptographic Authority pyopenssl version Before 17.5.0 contains a CWE - 401 : Failure to Release Memory Before Removing Last Reference vulnerability in PKCS #12 Store that can result in Denial of service if memory runs low or is exhausted. This attack appear to be exploitable via Depends upon calling application, however it could be as simple as initiating a TLS connection. Anything that would cause the calling application to reload certificates from a PKCS #12 store.. This vulnerability appears to have been fixed in 17.5.0.

Affected products

• Canonical Ubuntu Linux: version 16.04 only
• Pyopenssl Project 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 Gluster Storage: version 3.0 only
• Red Hat Openstack: version 13 only

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