Is CVE-2026-61915 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-61915?

CVE-2026-61915 has a CVSS v3 severity of MEDIUM (4.2).

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CVE-2026-61915

Description

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.