CVE-2018-5206: Debian Linux

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

When the channel topic is set without specifying a sender, Irssi before 1.0.6 may dereference a NULL pointer.

Affected products

• Debian Debian Linux: version 9.0 only
• Irssi Irssi: before 1.0.6 (fixed in 1.0.6)

Published 2018-01-06. Last modified 2026-06-17.