# Open-Xchange Dovecot CE vulnerabilities

Source: https://junglewise.ai/threats/technologies/dovecot-ce  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/dovecot-ce.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 8 vulnerabilities in Open-Xchange Dovecot CE: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-42006, was published on 12 May 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 8 (0 critical, 0 exploited in the wild)

## About Open-Xchange Dovecot CE

Dovecot Community Edition is an open-source IMAP and POP3 server for Linux and UNIX-like systems, written with security as a primary goal.

## Latest Open-Xchange Dovecot CE vulnerabilities

- [CVE-2026-42006: Open-Xchange Dovecot uncontrolled memory consumption in IMAP](https://junglewise.ai/threats/cve-2026-42006-open-xchange-dovecot-uncontrolled-memory-consumption-in-imap) (medium, CVSS 4.3, published 12 May 2026)
- [CVE-2026-40020: Open-Xchange Dovecot improper access control in IMAP SETACL](https://junglewise.ai/threats/cve-2026-40020-open-xchange-dovecot-improper-access-control-in-imap-setacl) (low, CVSS 3.1, published 12 May 2026)
- [CVE-2026-40016: Open-Xchange Dovecot CPU limit bypass in Sieve scripts](https://junglewise.ai/threats/cve-2026-40016-open-xchange-dovecot-cpu-limit-bypass-in-sieve-scripts) (medium, CVSS 5.3, published 12 May 2026)
- [CVE-2026-33603: Open-Xchange Dovecot SCRAM TLS channel binding spoofing](https://junglewise.ai/threats/cve-2026-33603-open-xchange-dovecot-scram-tls-channel-binding-spoofing) (medium, CVSS 6.8, published 12 May 2026)
- [CVE-2026-27851: Open-Xchange Dovecot injection via unsafe variable expansion](https://junglewise.ai/threats/cve-2026-27851-open-xchange-dovecot-injection-via-unsafe-variable-expansion) (high, CVSS 7.4, published 12 May 2026)
- [CVE-2026-27858: Open-Xchange Dovecot denial of service in ManageSieve](https://junglewise.ai/threats/cve-2026-27858-open-xchange-dovecot-denial-of-service-in-managesieve) (high, CVSS 7.5, published 27 Mar 2026)
- [CVE-2026-27857: Open-Xchange Dovecot denial of service via NOOP command memory exhaustion](https://junglewise.ai/threats/cve-2026-27857-open-xchange-dovecot-denial-of-service-via-noop-command-memory) (medium, CVSS 4.3, published 27 Mar 2026)
- [CVE-2025-59032: Open-Xchange Dovecot denial of service in ManageSieve AUTHENTICATE](https://junglewise.ai/threats/cve-2025-59032-open-xchange-dovecot-denial-of-service-in-managesieve) (high, CVSS 7.5, published 27 Mar 2026)

## Most severe Open-Xchange Dovecot CE vulnerabilities

- [CVE-2026-27858: Open-Xchange Dovecot denial of service in ManageSieve](https://junglewise.ai/threats/cve-2026-27858-open-xchange-dovecot-denial-of-service-in-managesieve) (high, CVSS 7.5, published 27 Mar 2026)
- [CVE-2025-59032: Open-Xchange Dovecot denial of service in ManageSieve AUTHENTICATE](https://junglewise.ai/threats/cve-2025-59032-open-xchange-dovecot-denial-of-service-in-managesieve) (high, CVSS 7.5, published 27 Mar 2026)
- [CVE-2026-27851: Open-Xchange Dovecot injection via unsafe variable expansion](https://junglewise.ai/threats/cve-2026-27851-open-xchange-dovecot-injection-via-unsafe-variable-expansion) (high, CVSS 7.4, published 12 May 2026)
- [CVE-2026-33603: Open-Xchange Dovecot SCRAM TLS channel binding spoofing](https://junglewise.ai/threats/cve-2026-33603-open-xchange-dovecot-scram-tls-channel-binding-spoofing) (medium, CVSS 6.8, published 12 May 2026)
- [CVE-2026-40016: Open-Xchange Dovecot CPU limit bypass in Sieve scripts](https://junglewise.ai/threats/cve-2026-40016-open-xchange-dovecot-cpu-limit-bypass-in-sieve-scripts) (medium, CVSS 5.3, published 12 May 2026)
- [CVE-2026-27857: Open-Xchange Dovecot denial of service via NOOP command memory exhaustion](https://junglewise.ai/threats/cve-2026-27857-open-xchange-dovecot-denial-of-service-via-noop-command-memory) (medium, CVSS 4.3, published 27 Mar 2026)
- [CVE-2026-42006: Open-Xchange Dovecot uncontrolled memory consumption in IMAP](https://junglewise.ai/threats/cve-2026-42006-open-xchange-dovecot-uncontrolled-memory-consumption-in-imap) (medium, CVSS 4.3, published 12 May 2026)
- [CVE-2026-40020: Open-Xchange Dovecot improper access control in IMAP SETACL](https://junglewise.ai/threats/cve-2026-40020-open-xchange-dovecot-improper-access-control-in-imap-setacl) (low, CVSS 3.1, published 12 May 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Open-Xchange technologies

- [Open-Xchange Dovecot Pro](https://junglewise.ai/threats/technologies/dovecot-pro): 28 vulnerabilities
- [Open-Xchange Dovecot](https://junglewise.ai/threats/technologies/open-xchange-dovecot): 5 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Open-Xchange Dovecot CE vulnerabilities", https://junglewise.ai/threats/technologies/dovecot-ce, 9 November 2026.