Description
The CalDAV feature in httpd in Cyrus IMAP 2.5.x through 2.5.12 and 3.0.x through 3.0.9 allows remote attackers to execute arbitrary code via a crafted HTTP PUT operation for an event with a long iCalendar property name.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cyrus-imapd | 3.0.8-6 | — |
| Debian 13 | cyrus-imapd | 3.0.8-6 | — |
| Debian 12 | cyrus-imapd | 3.0.8-6 | — |
| Debian 9 | cyrus-imapd | 2.5.10-3+deb9u1 | DSA-4458-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | cyrus-imapd | 2.5.10-3ubuntu1.1 | USN-4566-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | cyrus-imapd +2 | 3.0.7-15.el8_0.1 | RHSA-2019:1771 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cyrus-imapd | 3.8.4-1.1 | openSUSE-SU-2025:14968-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | cyrus-imapd +2 | 3.0.7-15.el8_0.1 | ELSA-2019-1771 |
Advisories 5
- USN-4566-1 cyrus-imapd vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4458-1 cyrus-imapd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:14968-1 cyradm-3.8.4-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2019:1771 Red Hat Security Advisory: cyrus-imapd security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ELSA-2019-1771 Important: cyrus-imapd security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
References
- https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html
- https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html
- https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html
- https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html
- FEDORA-2019-309f559057 vendor-advisory
- FEDORA-2019-f0435555ac vendor-advisory
- DSA-4458 vendor-advisory
- 20190609 [SECURITY] [DSA 4458-1] cyrus-imapd security update mailing-list
- RHSA-2019:1771 vendor-advisory
- USN-4566-1 vendor-advisory