CVE-2016-9584: libical allows remote attackers to cause a denial of service (use-after-free) and possibly read heap memory...

Security readout for executives and security teams

CVE-2016-9584 is a libical flaw triggered by a crafted calendar .ics file. The reported impact is application denial of service and possible heap memory disclosure. The source bundle does not identify affected versions, fixed versions, or confirmed exploitation, so urgency depends on whether business systems process untrusted calendar files with libical. Exposure is most likely in applications, services, mail clients, calendar tools, or gateways that use libical to parse calendar files from external or untrusted sources. The bundle lists affected vendor and product as n/a, so asset-level exposure must be confirmed by inventory. Prioritize assessment where calendar data crosses trust boundaries, such as email/calendar gateways and public scheduling workflows. Because affected versions and fixes are not identified in the bundle, first determine actual libical exposure before assigning emergency remediation work. Mitigation focus: Inventory libical usage in calendar, mail, scheduling, and file-ingestion components.; Check libical and OS/package vendor guidance for fixed versions or backported patches.; Update libical through trusted vendor packages when a fix is identified..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

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