In Irssi before 1.0.6, a calculation error in the completion code could cause a heap buffer overflow when completing certain strings.
https://www.debian.org/security/2018/dsa-4162
https://irssi.org/security/irssi_sa_2018_01.txt
Source: Mitre, NVD
Published: 2018-01-06
Updated: 2019-03-12
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical