CVE-2018-0500: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 6.4% chance of exploitation in the next 30 days.

Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

Affected products

• Canonical Ubuntu Linux: version 17.10 only; version 18.04 only
• Haxx Curl: from 7.54.1, up to and including 7.60.0

Published 2018-07-11. Last modified 2026-06-17.