# RLSA-2026:76763: dovecot security update

RLSA-2026:76763, released October 7, 2026, fixes 8 CVEs in dovecot (version 1:2.3.16-16.el8_10). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rlsa-2026-76763
- Platform: Linux
- Released: Oct 7, 2026
- Priority: High (Closes CVE-2026-33263, high severity)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://errata.rockylinux.org/RLSA-2026:76763

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [dovecot](https://patchblox.com/security/data/product/linux/dovecot.md) | rocky 8 | 1:2.3.16-16.el8_10 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-33263](https://patchblox.com/security/data/cve/CVE-2026-33263.md) | High | dovecot: When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic cause... | 9.1 | 0.0055 |  |
| [CVE-2026-33605](https://patchblox.com/security/data/cve/CVE-2026-33605.md) | High | dovecot: An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authe... | 9.1 | 0.0045 |  |
| [CVE-2026-42391](https://patchblox.com/security/data/cve/CVE-2026-42391.md) | High | dovecot: An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, whi... | 9.1 | 0.0045 |  |
| [CVE-2026-27852](https://patchblox.com/security/data/cve/CVE-2026-27852.md) | High | dovecot: Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind | 9.1 | 0.0043 |  |
| [CVE-2026-40019](https://patchblox.com/security/data/cve/CVE-2026-40019.md) | High | dovecot: An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spi... | 9.1 | 0.0037 |  |
| [CVE-2026-42007](https://patchblox.com/security/data/cve/CVE-2026-42007.md) | High | dovecot: An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-fr... | 9.1 | 0.0035 |  |
| [CVE-2026-40018](https://patchblox.com/security/data/cve/CVE-2026-40018.md) | High | dovecot: None None None No publicly available exploits are known. | 9.1 | 0.0032 |  |
| [CVE-2026-73208](https://patchblox.com/security/data/cve/CVE-2026-73208.md) | High | dovecot: An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token respon... | 9.1 | 0.0031 |  |

---

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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.