CVE-2026-47088 cyrusimap CVE debrief

Who should care

Users of Cyrus IMAP through version 3.12.2 should be aware of this vulnerability and take necessary precautions. This includes administrators and users who have access to the IMAP service and may be impacted by the vulnerability.

Technical summary

The vulnerability in Cyrus IMAP through 3.12.2 is caused by improper parsing of nested MIME comments. An authenticated IMAP user could exploit this by crafting a malicious email message with an RFC 822 comment ending with a backslash, potentially leading to heap exposure. This issue was discovered in cyrus-imapd. The vulnerability has a CVSS score of 3.1 and is classified as LOW severity. Users of Cyrus IMAP through version 3.12.2 should be aware of this vulnerability and take necessary precautions to prevent exploitation. The CVE record was published on 2026-07-16T19:16:49.513Z and has not been modified since then.

Defensive priority

Low

Recommended defensive actions

• Inventory and verify Cyrus IMAP version
• Restrict access to IMAP service
• Monitor for suspicious email activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-16T19:16:49.513Z and has not been modified since then. The NVD entry is currently in the 'Received' status. This information is based on the supplied source corpus and may not reflect the full scope or details of the vulnerability. Users should verify the information with the official CVE record and NVD entry for the most up-to-date and accurate information.

Official resources