# OPENSUSE-SU-2026:20554-1: dovecot24 security update

OPENSUSE-SU-2026:20554-1, released April 16, 2026, fixes 10 CVEs in dovecot24 (version 2.4.3-160000.1.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-20554-1
- Platform: Linux
- Released: Apr 16, 2026
- Priority: High (Closes CVE-2026-27858, high severity)
- CVEs: 10, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:20554-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [dovecot24](https://patchblox.com/security/data/product/linux/dovecot24.md) | opensuse-leap 16.0 | 2.4.3-160000.1.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-27858](https://patchblox.com/security/data/cve/CVE-2026-27858.md) | High | dovecot23: This update for dovecot23 fixes the following issues:  - CVE-2024-23184: parsing of messages containing many address... | 7.5 | 0.0080 |  |
| [CVE-2025-59032](https://patchblox.com/security/data/cve/CVE-2025-59032.md) | High | dovecot: ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response | 7.5 | 0.0073 |  |
| [CVE-2026-27857](https://patchblox.com/security/data/cve/CVE-2026-27857.md) | High | dovecot23: This update for dovecot23 fixes the following issues:  - CVE-2024-23184: parsing of messages containing many address... | 7.5 | 0.0068 |  |
| [CVE-2025-59028](https://patchblox.com/security/data/cve/CVE-2025-59028.md) | High | dovecot: When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authent... | 7.5 | 0.0046 |  |
| [CVE-2026-24031](https://patchblox.com/security/data/cve/CVE-2026-24031.md) | High | dovecot: Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin | 8.2 | 0.0040 |  |
| [CVE-2026-27856](https://patchblox.com/security/data/cve/CVE-2026-27856.md) | Routine | dovecot23: This update for dovecot23 fixes the following issues:  - CVE-2024-23184: parsing of messages containing many address... | 5.9 | 0.0040 |  |
| [CVE-2026-27859](https://patchblox.com/security/data/cve/CVE-2026-27859.md) | Routine | dovecot23: This update for dovecot23 fixes the following issues:  - CVE-2024-23184: parsing of messages containing many address... | 5.3 | 0.0038 |  |
| [CVE-2026-27855](https://patchblox.com/security/data/cve/CVE-2026-27855.md) | Routine | dovecot23: This update for dovecot23 fixes the following issues:  - CVE-2024-23184: parsing of messages containing many address... | 5.9 | 0.0032 |  |
| [CVE-2026-27860](https://patchblox.com/security/data/cve/CVE-2026-27860.md) | Routine | dovecot: If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication | 5.3 | 0.0030 |  |
| [CVE-2025-59031](https://patchblox.com/security/data/cve/CVE-2025-59031.md) | Routine | dovecot: Dovecot has provided a script to use for attachment to text conversion | 4.3 | 0.0029 |  |

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Data as of 2026-11-10T01:44:33Z 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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