CVE-2026-42007

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...

CVE-2026-33605

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...

CVE-2026-33263

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...

CVE-2026-52681

A flaw was found in dovecot. An authenticated attacker can bypass the configured Sieve CPU limit by repeatedly changing active scripts. This action prevents proper CPU resource accounting and leaves behind compiled script files, leading to sustained CPU and increased disk consumption. The...

CVE-2026-73208

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...

CVE-2026-40018

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. Mitigation Mitigation for this issue is either not available or the currently...

CVE-2026-27852

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...

Linux Distros Unpatched Vulnerability : CVE-2026-33604

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body t...

Linux Distros Unpatched Vulnerability : CVE-2026-73208

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the...

Linux Distros Unpatched Vulnerability : CVE-2026-33606

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protoco...

Linux Distros Unpatched Vulnerability : CVE-2026-42008

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that hos...

Unity Linux 20.1070a Security Update: dovecot (UTSA-2026-104990)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104990 advisory. An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so...

Linux Distros Unpatched Vulnerability : CVE-2026-42393

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the configured secret. An attacker with access to...

AZL-98295 CVE-2026-73208 affecting package dovecot 2.3.20-1

An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim...

ALPINE-CVE-2026-73208

An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim...

AZL-98283 CVE-2026-73209 affecting package dovecot 2.3.20-1

An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust its stack and crash. The affected process is terminated, which can cause degradation or denial of service for IMAP. Update to non-vulnerable version. No publicly available exploits...

CVE-2026-73208

An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim...

AZL-98271 CVE-2026-52681 affecting package dovecot 2.3.20-1

Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled script files are also not removed when a script is deleted or renamed. The configured Sieve CPU limit can be bypassed,...

ALPINE-CVE-2026-52687

An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such connections. The memory limit of the process is reached with only a few connections, terminating the process and all...

AZL-98292 CVE-2026-52687 affecting package dovecot 2.3.20-1

An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such connections. The memory limit of the process is reached with only a few connections, terminating the process and all...