CVE-2026-61908

State: Published
Severity: 3.1 Low
Published: Sep 9, 2026
Updated: Sep 10, 2026
Reserved: Jul 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	3.1 Low	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N	mitre

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Cyrus IMAPcyrusimap	before 3.8.8Affected 3.9.0 to before 3.10.4Affected 3.11.0 to before 3.12.4Affected

References

https://cyrusimap.org/
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html

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