CVE-2018-16839: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 5.8% chance of exploitation in the next 30 days.

Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Haxx Curl: from 7.33.0, up to and including 7.61.1

Published 2018-10-31. Last modified 2026-06-17.