CVE-2026-61908 Information disclosure in Cyrus IMAP

What is CVE-2026-61908?

CVE-2026-61908 is a low-severity vulnerability in cyrusimap Cyrus IMAP, published on 9 Sep 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 IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.

Weakness: CWE-125

Which versions are affected by CVE-2026-61908?

It affects 1 product.

Products include Cyrus Imap.

How do I fix CVE-2026-61908?

Upgrade to a fixed version.

Is CVE-2026-61908 being exploited?

There is no known exploitation of CVE-2026-61908 in the wild and no public exploit code.

Other vulnerabilities in cyrusimap Cyrus IMAP

• CVE-2019-18928 Auth bypass in n/a Critical 9.8
• CVE-2017-14230 Information disclosure in n/a Critical 9.1
• CVE-2021-33582 Denial of service in n/a High 7.5
• CVE-2015-8076 Information disclosure in n/a High 7.5
• CVE-2015-8077 Integer overflow in n/a High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-61908, GHSA-2x93-wv63-897r, UBUNTU-CVE-2026-61908.