CVE-2011-2943: Pidgin Libpurple

Medium severity, CVSS 4.3. EPSS: 3.6% chance of exploitation in the next 30 days.

The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.

Affected products

• Pidgin Libpurple: version 2.8.0 only; version 2.9.0 only
• Pidgin Pidgin: up to and including 2.9.0; version 2.0.0 only; version 2.0.1 only; version 2.0.2 only; version 2.1.0 only; version 2.1.1 only; …

Published 2011-08-29. Last modified 2026-06-16.