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Security vulnerabilities

This table contains a list of all known and fixed security vulnerabilities in WeeChat stable releases (the security vulnerabilities introduced during development of a version and fixed before a stable release are not mentioned).

Note: you can be warned about security vulnerabilities by subscribing to this mailing list: weechat-security ↗

Severity CVE Tracker Affected versions Fixed in version Release date Git Description / Workaround

medium 		CVE-2021-40516 - 0.4.1 → 3.2 3.2.1 Crash when decoding a malformed websocket frame in relay plugin.
> Workaround:
Either: remove all relays, unload relay plugin or secure relay to allow only some trusted IP addresses (option relay.network.allowed_ips).

low 		CVE-2020-9760 - 0.3.4 → 2.7 2.7.1 Buffer overflow when a new IRC message 005 is received with longer nick prefixes.
> There is no workaround.

low 		CVE-2020-9759 - 0.4.0 → 2.7 2.7.1 Crash when receiving a malformed IRC message 352 (WHO).
> There is no workaround.

low 		CVE-2020-8955 - 0.3.8 → 2.7 2.7.1 Buffer overflow when receiving a malformed IRC message 324 (channel mode).
> There is no workaround.

high 		CVE-2017-14727 - 0.3.2 → 1.9 1.9.1 Date/time conversion specifiers are expanded after replacing buffer local variables in name of log files. In some cases, this can lead to an error in function strftime and a crash caused by the use of an uninitialized buffer.
> Workaround:
Unload the logger plugin: /plugin unload logger

high 		CVE-2017-8073 - 0.3.3 → 1.7 1.7.1 Buffer overflow when removing quotes in DCC filename.
> Workaround:
Create a trigger (with WeeChat >= 1.1): /trigger add irc_dcc_quotes modifier "irc_in_privmsg" "${arguments} =~ ^[^ ]+ :${\x01}DCC SEND ${\x22} " "/.*//"

medium 		- - 0.3.8 → 0.4.0 0.4.1 Uncontrolled format string when IRC commands are redirected by relay plugin. If the output or redirected command contains formatting chars like "%", this can lead to a crash of WeeChat.
> Workaround:
Do not use irc protocol in relay plugin.

low 		- - 0.3.0 → 0.4.0 0.4.1 Uncontrolled format string when sending unknown IRC command to server (if option "irc.network.send_unknown_commands" is on).
> Workaround:
Turn off option "irc.network.send_unknown_commands" or do not use formatting chars like "%" when sending unknown commands to server.

low 		- - 0.3.6 → 0.4.0 0.4.1 Uncontrolled format string when sending IRC "ison" command for nicks monitored with command /notify.
> Workaround:
Do not use command /notify with nicks containing formatting chars like "%".

critical 		CVE-2012-5534 bug #37764 0.3.0 → 0.3.9.1 0.3.9.2 Untrusted command for function hook_process could lead to execution of commands, because of shell expansions (so the problem is only caused by some scripts, not by WeeChat itself).
> Workaround:
Remove/unload all scripts calling function hook_process (for maximum safety).

high 		CVE-2012-5854 bug #37704 0.3.6 → 0.3.9 0.3.9.1 Buffer overflow when decoding IRC colors in strings.
> Workaround:
/set irc.network.colors_receive off

medium 		CVE-2011-1428 patch #7459 0.1.3 → 0.3.4 0.3.5 Missing verifications in SSL certificate, which allows man-in-the-middle attackers to spoof an SSL chat server via an arbitrary certificate.
> There is no workaround.

high 		CVE-2009-0661 bug #25862 0.2.6 0.2.6.1 Crash when receiving special chars in IRC messages.
> There is no workaround.

low 		- - 0.0.5 → 0.1.6 0.1.7 Uncontrolled format string in API function infobar_printf.
> There is no workaround.

low 		- - 0.0.1 → 0.0.4 0.0.5 Buffer overflows in build of strings.
> There is no workaround.

Security vulnerabilities are classified using 4 severity levels:

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