Is CVE-2026-61908 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-61908?

CVE-2026-61908 has a CVSS v3 severity of LOW (3.1).

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CVE-2026-61908

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.