CVE-2026-61915 [MEDIUM] – An issue was discovered in Cyrus IMAP before 3.12.4. There is a VPATCH BYPARAM double-free

An issue was discovered in Cyrus IMAP before 3.12.4. There is a VPATCH BYPARAM double-free. An authenticated calendar user could crash a Cyrus CalDAV worker with a PATCH containing PATCH-ACTION=”BYPARAM@…” against a resource with two or more properties of the matched kind. The memory holding the selector would be freed once on each iteration over the properties.