CVE-2010-1156: core/nicklist.c in Irssi before 0.8.15 allows remote attackers to cause a denial of service (NULL pointer d...

Security readout for executives and security teams

CVE-2010-1156 is a remote denial-of-service flaw in Irssi before 0.8.15. A malicious IRC-side interaction could crash the user’s Irssi client during nickname matching when a victim leaves a channel. The business impact is availability loss for users relying on Irssi, not evidence of data theft or system takeover. Exposure is most likely on workstations, jump hosts, or operations environments where Irssi versions earlier than 0.8.15 are used to connect to IRC networks or shared channels. The provided affected-product metadata is incomplete, so validation should rely on installed package versions and vendor advisories. Prioritize as a routine availability fix where Irssi is still used. It is not supported by the bundle as a critical enterprise compromise risk, but outdated IRC clients on operational hosts should be cleaned up because crashes can disrupt support or engineering workflows. Mitigation focus: Upgrade Irssi to 0.8.15 or a vendor package containing the fix.; Apply relevant distribution security updates from Ubuntu, SUSE, Fedora, or Slackware where applicable.; Limit use of obsolete Irssi clients on untrusted IRC networks..

Prepared

Jun 28, 2026, 02:49 UTC (UTC+00:00)

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