# CVE-2026-61915

## Summary

- **CVE ID:** CVE-2026-61915
- **Severity:** MEDIUM
- **CVSS Score:** 4.2 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L)
- **CWE:** CWE-415
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## 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.

## Affected Products

- cyrusimap — Cyrus IMAP (0)
- cyrusimap — Cyrus IMAP (3.9.0)
- cyrusimap — Cyrus IMAP (3.11.0)

## References

- [CNA](https://cyrusimap.org)
- [CNA](https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html)
- [CNA](https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html)
- [CNA](https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._