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.
Published: 2026-09-09
Score: 3.1 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 09 Sep 2026 22:30:00 +0000

Type Values Removed Values Added
Title Out‑of‑Bounds Read via JMAP Blob ID in Cyrus IMAP

Wed, 09 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
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.
First Time appeared Cyrusimap
Cyrusimap cyrus Imap
Weaknesses CWE-125
CPEs cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
Vendors & Products Cyrusimap
Cyrusimap cyrus Imap
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Subscriptions

Cyrusimap Cyrus Imap
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-09T19:44:57.533Z

Reserved: 2026-07-13T00:00:00.000Z

Link: CVE-2026-61908

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-09T20:18:36.383

Modified: 2026-09-09T20:22:32.663

Link: CVE-2026-61908

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T22:15:17Z

Weaknesses