libical 4.0.6 contains an incompatible function pointer in icalparameter_string_to_kind(). When parsing iCalendar data containing a parameterized property, the function passes icalparameter_compare_kind_map() to bsearch() through an incompatible comparator function pointer type. bsearch() invokes the callback through the mismatched type, resulting in undefined behavior and process termination, leading to denial of service.

• azl3 libical 3.0.10-1 on Azure Linux 3.0

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1. Oct 15, 2026 at 11:25 AM UTC
   • Added fixed versions: 3.0.10-2.

1. Oct 9, 2026 at 1:32 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Oct 10, 2026 at 9:45 AM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Oct 14, 2026 at 3:08 PM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

4. Oct 20, 2026 at 1:05 PM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.