CVE-2018-20102: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 4.2% chance of exploitation in the next 30 days.

An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 18.10 only
• Haproxy Haproxy: up to and including 1.8.14
• Red Hat Openshift Container Platform: version 3.11 only

Published 2018-12-12. Last modified 2026-06-17.