CVE-2011-4603: The silc_channel_message function in ops.c in the SILC protocol plugin in libpurple in Pidgin before 2.10.1...

Security readout for executives and security teams

This flaw lets a remote party crash vulnerable Pidgin/libpurple clients that process crafted SILC messages. The known impact is denial of service, not code execution or data theft. Organizations are mainly exposed where older Pidgin versions or distro backports still include and use the SILC protocol plugin. Exposure is likely limited to endpoints or packaged applications running vulnerable Pidgin/libpurple builds with the SILC protocol plugin present and used. Modern environments without SILC usage are less likely exposed. Treat as a targeted availability risk for legacy instant messaging clients. Prioritize patching where Pidgin/libpurple and SILC are actually used; otherwise handle through normal vulnerability hygiene and legacy software reduction. Mitigation focus: Upgrade Pidgin/libpurple to 2.10.1 or a vendor-fixed backported package.; Apply relevant Red Hat or openSUSE security updates where those packages are used.; Disable or remove the SILC protocol plugin if immediate patching is unavailable..

Prepared

Jun 27, 2026, 17:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.