CVE-2026-61908

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.

CVSS v3 3.1 LOW

3.1^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.6 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:cyrus:imap::::::::
	cpe:2.3:a:cyrus:imap::::::::
	cpe:2.3:a:cyrus:imap::::::::

History

16 Sep 2026, 15:24

Type	Values Removed	Values Added
First Time		Cyrus Cyrus imap
CPE		cpe:2.3:a:cyrus:imap::::::::
References	~~() https://cyrusimap.org -~~	() https://cyrusimap.org - Product
References	~~() 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/3.10/x/3.10.4.html - Release Notes
References	~~() 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/3.12/x/3.12.4.html - Release Notes
References	~~() https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html -~~	() https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html - Release Notes

Information

Published : 2026-09-09 20:18

Updated : 2026-09-16 15:24

NVD link : CVE-2026-61908

Mitre link : CVE-2026-61908

CVE.ORG link : CVE-2026-61908

JSON object : View

Products Affected

cyrus

imap

CWE

CWE-125

Out-of-bounds Read

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