irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-8955
• weechat/weechat@6f4f147
• https://lists.debian.org/debian-lts-announce/2020/03/msg00031.html
• https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4ASRTCQFFDAAK347URWNDH6NSED2BGNY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ER23GT23US5JXDLUZAMGMWXKZ74MI4S2/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M3LAJTLI3LWZRNCFYJ7PCBBTHUMCCBHH/
• https://security.gentoo.org/glsa/202003-51
• https://weechat.org/doc/security/
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00032.html