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The client of the future https://irssi.org
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  • XS 3.4%
  • Perl 2.1%
  • Meson 2%
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Devon Kirk 283d846787 dcc-chat: cap CTCP body length used in dynamic signal name 
The body of a CTCP message received over an established DCC CHAT
connection is concatenated into a dynamic signal name and emitted via
signal_emit. The first whitespace-separated token becomes the CTCP
command and the remainder is delivered to any matching handler as the
second argument, including loaded perl scripts.

While irssi itself does not crash on unknown signal names (the signal
system interns them and signal_emit returns FALSE for no-match), the
unbounded body length widens the attack surface for any perl script
that operates unsafely on the CTCP argument.

A 256-byte cap on the body that is concatenated into the signal name
limits the attack surface and aligns with the convention used for
CTCP-over-IRC handling.
2026-07-01 17:15:57 -04:00
.github/workflows Add muon fmt GitHub Actions workflow 2026-01-26 21:02:10 -08:00
.obs test OBS workflow 2022-05-19 14:37:59 +02:00
docs run meson formatter 2026-01-25 22:07:44 +01:00
fuzz-support Fix some glib deprecation warnings 2019-10-31 23:49:40 +01:00
scripts run meson formatter 2026-01-25 22:07:44 +01:00
src dcc-chat: cap CTCP body length used in dynamic signal name 2026-07-01 17:15:57 -04:00
subprojects up glib wrap 2026-01-23 21:21:10 +01:00
tests run meson formatter 2026-01-25 22:07:44 +01:00
themes run meson formatter 2026-01-25 22:07:44 +01:00
utils fix clang-format-xs boot code 2026-01-24 20:53:29 +01:00
.clang-format fix clang formatting 2021-04-01 21:21:06 +02:00
.gitattributes Add .gitattributes to ensure all shell scripts have LF as eol-style. 2016-01-31 20:49:59 +02:00
.gitignore good-bye and thanks, autotools 2022-02-19 21:44:10 +01:00
.muon_fmt.ini run meson formatter 2026-01-25 22:07:44 +01:00
AUTHORS Add OTR support. 2018-02-26 23:32:57 +01:00
COPYING Update FSF address. 2007-05-08 17:51:51 +00:00
INSTALL Add a few more compile dependencies to INSTALL document 2026-01-23 22:17:39 +01:00
irssi-icon.png New icon by ditCh. 2008-03-04 17:46:11 +00:00
irssi.conf new SHELP default alias 2022-04-24 15:40:20 +02:00
MANIFEST.in Add some missing files to make-dist 2022-02-20 18:55:45 +01:00
meson.build Format root meson.build 2026-01-26 21:02:10 -08:00
meson_options.txt remove deprecated defines 2022-02-20 17:33:36 +01:00
NEWS Merge tag '1.4.5' into integrate/1.4.5 2023-10-01 19:19:33 +02:00
README.md Update minimum required Perl version in readme 2024-04-01 22:10:35 +02:00
TODO Add todo for gnutls. 2008-03-30 13:53:33 +00:00

README.md

Irssi

Build Status

Irssi is a modular text mode chat client. It comes with IRC support built in, and there are third party ICB, SILC, XMPP (Jabber), PSYC and Quassel protocol modules available.

irssi

Download information

Development source installation

Ninja 1.8 and Meson 0.53

git clone https://github.com/irssi/irssi
cd irssi
meson Build
ninja -C Build && sudo ninja -C Build install

Release source installation

  • Download release
  • Verify signature
tar xJf irssi-*.tar.xz
cd irssi-*
meson Build
ninja -C Build && sudo ninja -C Build install

Requirements

See the INSTALL file for details

Documentation

Themes

Scripts

Modules

Security information

Please report security issues to staff@irssi.org. Thanks!

Bugs / Suggestions / Contributing

Check the GitHub issues if it is already listed in there; if not, open an issue on GitHub or send a mail to staff@irssi.org.

Irssi is always looking for developers. Feel free to submit patches through GitHub pull requests.

You can also contact the Irssi developers in #irssi on irc.libera.chat.