CVE-2026-61908
Publication date 9 September 2026
Last updated 11 September 2026
Ubuntu priority
Description
JMAP email-header blob ID out-of-bounds index: An authenticated user could attempt to download a specially 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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| cyrus-imapd | 26.04 LTS resolute |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
Notes
mrmajumder
Vendor patch for versions 3.8, 3.10 and 3.12 stored in the embargoed repository at fixes/cyrus-imapd/patches-<version>/CVE-2026-61908.patch. For versions older than 3.8, the 3.8 patches might need to be backported
Severity score breakdown
CVSS version: CVSS v3.0
Base score
3.1 · Low
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N