CVE-2020-11100: Canonical Ubuntu Linux

High severity, CVSS 8.8. EPSS: 61.6% chance of exploitation in the next 30 days.

In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2 request, possibly causing remote code execution.

Affected products

• Canonical Ubuntu Linux: version 18.04 only; version 19.10 only
• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Haproxy Haproxy: from 1.8.0, before 2.1.4 (fixed in 2.1.4)
• Opensuse Leap: version 15.1 only
• Red Hat Openshift Container Platform: version 3.11 only; version 4.0 only

Published 2020-04-02. Last modified 2026-06-17.