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...

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...

dovecot security update

1:2.3.21-19.8 - fix CVE-2026-33605: ManageSieve: denial of service via lone CR character causing protocol deadlock RHEL-251984 1:2.3.21-19.7 - fix CVE-2026-42007: fix use-after-free and info leak in sieve editheader extension RHEL-251945 1:2.3.21-19.6 - fix CVE-2026-40018: incorrect escaping of...

ALSA-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...

Rocky Linux 8 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (crlsa-2026_76763)

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-202676763 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorrect...

dovecot security, bug fix, and enhancement update

An update is available for dovecot. This update affects Rocky Linux 8. 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-2026:76763 Important: dovecot security, bug fix, and enhancement 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...

AlmaLinux 8 : dovecot (ALSA-2026:76763)

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:76763 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorrect...

Oracle Linux 8 : dovecot (ELSA-2026-76763)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-76763 advisory. - fix CVE-2026-33605: ManageSieve login deadlock caused by lone CR protocol violation RHEL-251995 - fix CVE-2026-42007: heap use-after-free in...

RockyLinux 8 : dovecot (RLSA-2026:76763)

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:76763 advisory. dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters CVE-2026-42391 dovecot: Dovecot: Authentication bypass via incorrect...

dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion

A flaw was found in the Dovecot mail server's submission-login component. This vulnerability occurs when the server reaches its maximum allowed user IP connections, leading to a crash due to file descriptor handling issues. This can result in a denial of service, preventing users from sending...

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: MySQL multi-byte escaping wrong

A flaw was found in Dovecot. A remote attacker with high attack complexity could exploit this vulnerability to gain access to sensitive information and modify data without requiring any user interaction or privileges...

dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters

A flaw was found in Dovecot. An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in. This action causes the server to consume excessive memory and CPU resources, leading to the termination of login processes and other active connections...

dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation

A flaw was found in Dovecot. This vulnerability allows an attacker to bypass authentication by exploiting how OAuth2 tokens are validated. If an OAuth2 token response does not include a scope claim, Dovecot incorrectly uses the audience claim in its place for authorization checks. This can lead t...

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...

Important: Red Hat Security Advisory: dovecot security, bug fix, and enhancement update

An update for dovecot is now available for Red Hat Enterprise Linux 8. 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 crafted email headers

A flaw was found in dovecot. A remote attacker can craft a malicious email with an excessive number of email addresses or MIME parameters in its headers. When a user attempts to read this message over IMAP, the parsing process consumes an inordinate amount of memory, leading to the termination of...

dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free

A flaw was found in Dovecot. An authenticated attacker can use a Sieve script with the editheader extension to trigger a use-after-free vulnerability in the mail editing code. This can lead to memory corruption, potentially crashing the mail delivery process and allowing for arbitrary code...