When the channel topic is set without specifying a sender, Irssi before 1.0.6 may dereference a NULL pointer.
{
"unresolved_ranges": [
{
"source": "CPE_FIELD",
"cpe": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
"extracted_events": [
{
"last_affected": "9.0"
}
]
}
]
}