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USN-4119-1: Irssi vulnerability

3 September 2019

Irssi could be made to crash or execute arbitrary code if it received a specially crafted CAP request.



  • irssi - terminal based IRC client


It was discovered that Irssi incorrectly handled certain CAP requests.
An attacker could possibly use this issue to cause a denial of service or
execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.04

After a standard system update you need to restart Irssi to make
all the necessary changes.