dovecot: denial of service via crafted message before authentication

A flaw was found in dovecot. An unauthenticated and remote attacker can send a crafted message that causes managesieve to allocate an excessive amount of memory, forcing managesieve-login to be unavailable by repeatedly crashing the process, resulting in a denial of service...

dovecot24-2.4.4-1.1 on GA media (moderate)

dovecot24-2.4.4-1.1 on GA media Announcement ID: openSUSE-SU-2026:10766-1 Rating: moderate Cross-References: CVE-2026-27851 CVE-2026-33603 CVE-2026-40016 CVE-2026-40020 CVE-2026-42006 CVSS scores: CVE-2026-27851 SUSE : 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVE-2026-27851 SUSE : 9.1...

RHEL 10 : dovecot (RHSA-2026:17602)

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17602 advisory. Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3...

RHEL 9 : dovecot (RHSA-2026:17628)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17628 advisory. Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3...

RHEL 9 : dovecot (RHSA-2026:17630)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17630 advisory. Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3...

RHEL 9 : dovecot (RHSA-2026:17626)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17626 advisory. Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3...

CLSA-2026-1778250399 dovecot: Fix of CVE-2026-27857

CVE-2026-27857: imap-login: limit IMAP parser open lists to prevent excessive memory usage...

dovecot: Fix of CVE-2026-27857

CVE-2026-27857: imap-login: limit IMAP parser open lists to prevent excessive memory usage...

SUSE CVE-2026-33603

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and...

SUSE CVE-2026-40020

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imapaclallowanyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed...

MiracleLinux 8 : dovecot-2.3.16-7.el8_10 (AXSA:2026-611:02)

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-611:02 advisory. dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command CVE-2025-59032 dovecot: denial of service via craft...

CLSA-2026-1778614755 dovecot: Fix of 2 CVEs

CVE-2026-27858: managesieve: fix DoS via crafted message before authentication that caused excessive memory allocation - CVE-2025-59032: managesieve: fix crash when AUTHENTICATE command does not finish on the first call literal SASL initial response...

EUVD-2026-29471

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imapaclallowanyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed...

EUVD-2026-29468

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and...

CVE-2026-40020

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imapaclallowanyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed...

CVE-2026-33603

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and...

CVE-2026-33603

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and...

UBUNTU-CVE-2026-33603

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and...

CVE-2026-40020

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imapaclallowanyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed...

CVE-2026-40020

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imapaclallowanyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed...