# CVE-2026-61908: cyrus-imapd: An issue was discovered in Cyrus IMAP before 3.12.4

CVE-2026-61908 is fixed in 13 products on 1 platform, first by FEDORA-2026-97A7EC5786, released September 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-61908
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 9, 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cyrus-imapd Debian 14 | 3.12.4-1 | [DEBIAN-CVE-2026-61908](https://patchblox.com/security/data/fix/linux/debian-cve-2026-61908.md) | Sep 17, 2026 |
| Linux | cyrus-imapd Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd opensuse-leap 16.0 | 3.8.8-bp160.1.1 | [OPENSUSE-SU-2026:21929-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21929-1.md) | Sep 22, 2026 |
| Linux | cyrus-imapd-debuginfo Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-debugsource Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-devel Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-doc-extra Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-libs Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-libs-debuginfo Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-utils Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-utils-debuginfo Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-virusscan Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | cyrus-imapd-virusscan-debuginfo Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | perl-Cyrus Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |
| Linux | perl-Cyrus-debuginfo Fedora 43 | 3.10.4-1.fc43 | [FEDORA-2026-97A7EC5786](https://patchblox.com/security/data/fix/linux/fedora-2026-97a7ec5786.md) | Sep 14, 2026 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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