CVE-2018-20615: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 4.5% chance of exploitation in the next 30 days.

An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1.9.x through 1.9.0 which can result in a crash. The processing of the PRIORITY flag in a HEADERS frame requires 5 extra bytes, and while these bytes are skipped, the total frame length was not re-checked to make sure they were present in the frame.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 18.10 only
• Haproxy Haproxy: from 1.8.0, up to and including 1.8.19; version 1.9.0 only
• Opensuse Leap: version 15.0 only
• Red Hat Enterprise Linux: version 7.0 only; version 7.4 only; version 7.5 only; version 7.6 only
• Red Hat Openshift Container Platform: version 3.11 only

Published 2019-03-21. Last modified 2026-06-17.