# Dovecot vulnerabilities

Source: https://junglewise.ai/threats/vendors/dovecot  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 10 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/dovecot.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 16 vulnerabilities in Dovecot: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-33605, was published on 28 August 2026. Nothing was published in the last eight weeks. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 16 (0 critical, 0 exploited in the wild)

## About Dovecot

IMAP and POP3 email server implementation providing secure mail access functionality.

## Latest Dovecot vulnerabilities

- [CVE-2026-33605: Dovecot ManageSieve denial of service via malformed pre-auth command](https://junglewise.ai/threats/cve-2026-33605-dovecot-managesieve-denial-of-service-via-malformed-pre-auth) (high, CVSS 7.5, published 28 Aug 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)
- [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-2026-27860: If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This…](https://junglewise.ai/threats/cve-2026-27860-if-auth-username-chars-is-empty-it-is-possible-to-inject) (low, CVSS 3.7, published 27 Mar 2026)
- [CVE-2026-27859: A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably…](https://junglewise.ai/threats/cve-2026-27859-a-mail-message-containing-excessive-amount-of-rfc-2231-mime) (medium, CVSS 5.3, published 27 Mar 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-2026-27856: Dovecot Doveadm timing oracle vulnerability in credential verification](https://junglewise.ai/threats/cve-2026-27856-dovecot-doveadm-timing-oracle-vulnerability-in-credential) (high, CVSS 7.4, published 27 Mar 2026)
- [CVE-2026-27855: Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and…](https://junglewise.ai/threats/cve-2026-27855-dovecot-otp-authentication-is-vulnerable-to-replay-attack-under) (medium, CVSS 6.8, published 27 Mar 2026)
- [CVE-2026-24031: Dovecot SQL authentication bypass via cleared auth_username_chars](https://junglewise.ai/threats/cve-2026-24031-dovecot-sql-authentication-bypass-via-cleared-auth-username-chars) (high, CVSS 7.7, published 27 Mar 2026)
- [CVE-2026-0394: When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or…](https://junglewise.ai/threats/cve-2026-0394-when-dovecot-has-been-configured-to-use-per-domain-passwd-files) (medium, CVSS 5.3, 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)
- [CVE-2025-59028: When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active…](https://junglewise.ai/threats/cve-2025-59028-when-sending-invalid-base64-sasl-data-login-process-is) (medium, CVSS 5.3, published 27 Mar 2026)

## Most severe Dovecot vulnerabilities

- [CVE-2026-24031: Dovecot SQL authentication bypass via cleared auth_username_chars](https://junglewise.ai/threats/cve-2026-24031-dovecot-sql-authentication-bypass-via-cleared-auth-username-chars) (high, CVSS 7.7, published 27 Mar 2026)
- [CVE-2026-33605: Dovecot ManageSieve denial of service via malformed pre-auth command](https://junglewise.ai/threats/cve-2026-33605-dovecot-managesieve-denial-of-service-via-malformed-pre-auth) (high, CVSS 7.5, published 28 Aug 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-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-2026-27856: Dovecot Doveadm timing oracle vulnerability in credential verification](https://junglewise.ai/threats/cve-2026-27856-dovecot-doveadm-timing-oracle-vulnerability-in-credential) (high, CVSS 7.4, 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-2026-27855: Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and…](https://junglewise.ai/threats/cve-2026-27855-dovecot-otp-authentication-is-vulnerable-to-replay-attack-under) (medium, CVSS 6.8, published 27 Mar 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-2025-59028: When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active…](https://junglewise.ai/threats/cve-2025-59028-when-sending-invalid-base64-sasl-data-login-process-is) (medium, CVSS 5.3, published 27 Mar 2026)
- [CVE-2026-0394: When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or…](https://junglewise.ai/threats/cve-2026-0394-when-dovecot-has-been-configured-to-use-per-domain-passwd-files) (medium, CVSS 5.3, published 27 Mar 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 | 1 | 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 |

## Dovecot technologies

- [Dovecot](https://junglewise.ai/threats/technologies/dovecot): 16 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, "Dovecot vulnerabilities", https://junglewise.ai/threats/vendors/dovecot, 10 November 2026.