Astra Linux – Vulnerability in dovecot

The ManageSieve AUTHENTICATE command crashes when using “literal” as the initial response to SASL. This can be used to repeatedly crash the ManageSieve service, rendering it unavailable to other users. It’s recommended to control access to the ManageSieve port or disable the service if it’s not...

MiracleLinux 9 : dovecot-2.3.16-18.el9_8.8 (AXSA:2026-2051:08)

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-2051:08 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorre...

dovecot security update

An update is available for dovecot. This update affects Rocky Linux 9. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list Dovecot is an IMAP server for Linux and other UNIX-like systems, written...

RLSA-2026:80825 Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. Security Fixes: doveco...

Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: dovecot (UTSA-2026-130082)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-130082 advisory. An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. If running in high-security mode...

Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: dovecot (UTSA-2026-130078)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-130078 advisory. An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can...

MiracleLinux 8 : dovecot-2.3.16-16.el8_10 (AXSA:2026-2032:07)

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-2032:07 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorre...

Important: Red Hat Security Advisory: dovecot security update

An update for dovecot is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from t...

dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve

A flaw was found in Dovecot's ManageSieve login process. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted, truncated quoted argument. This action causes the process to enter an infinite loop, consuming excessive CPU resources. Repeated exploitation can lea...

dovecot: Dovecot: Denial of Service in ManageSieve login process

A flaw was found in Dovecot. An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. This can lead to a denial of service for Sieve script management, affecting either the attacker's connection or all connections handled by t...

dovecot security update

1:2.3.16-18.8 - fix CVE-2026-33605: ManageSieve protocol denial of service via lone CR character RHEL-251989 1:2.3.16-18.7 - fix CVE-2026-42007: use-after-free in pigeonhole editheader RHEL-251952 1:2.3.16-18.6 - fix CVE-2026-40018: incorrect escaping of multi-byte strings in SQL commands...

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. Security Fixes: doveco...

Rocky Linux 10.2 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (crlsa-2026_79371)

The Rocky Linux 10.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-202679371 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorrect...

ALSA-2026:80825 Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. Security Fixes: doveco...

dovecot security update

An update is available for dovecot. This update affects Rocky Linux 10. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list Dovecot is an IMAP server for Linux and other UNIX-like systems, written...

RLSA-2026:79371 Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. Security Fixes: doveco...

RockyLinux 10 : dovecot (RLSA-2026:79371)

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:79371 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorrect...

RHEL 10 : dovecot (RHSA-2026:79371)

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:79371 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...

AlmaLinux 10 : dovecot (ALSA-2026:79371)

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:79371 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorrect...

Important: Red Hat Security Advisory: dovecot security update

An update for dovecot is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from...