CVE-2026-47088 Information disclosure in Cyrus IMAP
An authenticated user can read heap memory by crafting a specific email message, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47088?
CVE-2026-47088 is a low-severity vulnerability in cyrusimap Cyrus IMAP, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is heap exposure in nested MIME comment parsing. An authenticated IMAP user could craft an email message containing an RFC 822 comment ending with a backslash. When parsing the message, the server would read past the message's end in memory, and read into the heap, returning the read content to the user.
Weakness: CWE-126
Which versions are affected by CVE-2026-47088?
How do I fix CVE-2026-47088?
Upgrade to a fixed version.
Is CVE-2026-47088 being exploited?
There is no known exploitation of CVE-2026-47088 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-47088, GHSA-f77j-qm5m-p6cw, UBUNTU-CVE-2026-47088.