CVE-2026-61908
Published:September 09, 2026
Updated:September 22, 2026
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.
Affected Packages
https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.11.0-alpha0 <cyrus-imapd-3.12.4Fix Suggestion:
Update to version cyrus-imapd-3.12.4https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.7.0-alpha0 <cyrus-imapd-3.8.8Fix Suggestion:
Update to version cyrus-imapd-3.8.8https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.9.0-alpha0 <cyrus-imapd-3.10.4Fix Suggestion:
Update to version cyrus-imapd-3.10.4Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Out-of-bounds Read
EPSS
Base Score:
0.22