What’s Vulnerable › Vulnerabilities

CVE-2026-61915

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-09 · updated 2026-09-16
• Weakness: CWE-415

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: before 3.8.8; from 3.9.0 before 3.10.4; from 3.11.0 before 3.12.4 — fixed in 3.10.4, 3.12.4, 3.8.8

How to fix

Upgrade to a fixed version: cyrusimap Cyrus IMAP 3.10.4, 3.12.4, 3.8.8. Check the vendor advisory for mitigations.

References

• https://cyrusimap.org
• https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
• https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
• https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html

Get alerted when CVE-2026-61915 or the next vulnerability affects your stack