The following updates has been released for Debian GNU/Linux 9

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Debian Security Advisory DSA-4458-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
June 08, 2019 https://www.debian.org/security/faq
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Package : cyrus-imapd
CVE ID : CVE-2019-11356

A flaw was discovered in the CalDAV feature in httpd of the Cyrus IMAP
server, leading to denial of service or potentially the execution of
arbitrary code via a crafted HTTP PUT operation for an event with a long
iCalendar property name.

For the stable distribution (stretch), this problem has been fixed in
version 2.5.10-3+deb9u1.

We recommend that you upgrade your cyrus-imapd packages.

For the detailed security status of cyrus-imapd please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/cyrus-imapd

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

  Cyrus-imapd Security Update for Debian 9