CVE-2016-5825: The icalparser_parse_string function in libical 0.47 and 1.0 allows remote attackers to cause a denial of s...

Security readout for executives and security teams

CVE-2016-5825 is a denial-of-service issue in libical, a calendar parsing library. A specially crafted ICS calendar file can trigger an out-of-bounds heap read and crash software that parses it. The public record names libical 0.47 and 1.0. There is no cited evidence of active exploitation. Exposure is most likely where applications or services use libical 0.47 or 1.0 to process calendar data from users, email, synchronization feeds, or other untrusted sources. Treat this as a targeted availability risk, not an emergency remote-code-execution issue. Prioritize systems that automatically process external calendar files, especially business-critical mail, calendaring, or scheduling workflows. Mitigation focus: Inventory applications and packages that include libical.; Identify any use of libical 0.47 or 1.0.; Check libical and operating-system vendor guidance for fixed packages..

Prepared

Jun 13, 2026, 11:21 UTC (UTC+00:00)

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