Irssi vulnerabilities

In Irssi before version 1.0.5, overlong nicks or targets may result in a NULL pointer dereference while splitting the message.

In Irssi before version 1.0.5, certain incorrectly formatted DCC CTCP messages could lead to a NULL pointer dereference.

Irssi before 1.0.5, when installing themes with unterminated colour formatting sequences, may access data beyond the end of the string.

Irssi before 1.0.5 may incorrectly fail to remove destroyed channels from the query list while waiting for channel synchronization, leading to use-after-free conditions when updating the state later on.

In Irssi before version 1.0.3, when receiving certain incorrectly quoted DCC files, it tries to find the terminating quote one byte before the allocated memory. This may lead to application crashes.

In Irssi before version 1.0.3, when receiving a DCC message without source nick/host, it attempts to dereference a NULL pointer. This can lead to application crashes.

Irssi before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via a string containing a formatting sequence (%[) without a closing bracket (]).

Irssi versions 0.8.18 and earlier before 0.8.21 allow remote attackers to cause a denial of service (out-of-bounds read and crash) via vectors involving strings that are not UTF8.

Irssi versions 0.8.17 and earlier before 0.8.21 are vulnerable to an attack that can lead to denial of service through a crafted ANSI x8 color code causing an out-of-bounds read and application crash.

A use-after-free vulnerability in Irssi before version 0.8.21 allows remote attackers to cause a denial of service (crash) via an invalid nick message.

The nickcmp function in Irssi before version 0.8.21 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a message without a nick.

The format_send_to_gui function in the format parsing code in Irssi before 0.8.20 allows remote attackers to cause a denial of service (heap corruption and crash) via vectors involving the length of a string.

The unformat_24bit_color function in the format parsing code in Irssi before version 0.8.20, when compiled with true-color support enabled, allows remote attackers to cause a denial of service (heap corruption and crash) via an incomplete 24bit color code.

An issue was discovered in Irssi before version 1.0.4 related to updating the internal nick list. The application could incorrectly use the GHashTable interface, leading to freeing the nick during the update, resulting in use-after-free conditions on each access of the hash table.

An issue was discovered in Irssi before version 1.0.4, which occurs when receiving messages with invalid time stamps. In this case, Irssi attempts to dereference a NULL pointer.