UBUNTU-CVE-2026-42392

An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Process memory contents can be disclosed to the client, which may include sensitive data. Disable the IMAP URLAUTH...

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...

CVE-2026-33607: Uncontrolled Resource Consumption

An attacker that has valid credentials can use IMAP LIST command to consume CPU. This can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed version. No publicly available exploits are...

CVE-2026-40014: Uncontrolled Resource Consumption

An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. Monitor...

CVE-2026-40015

An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and crash the process. The crash interrupts hibernated IMAP sessions handled by the affected process, which can cause...

CVE-2026-40015: Out-of-bounds Read

An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and crash the process. The crash interrupts hibernated IMAP sessions handled by the affected process, which can cause...

CVE-2026-40014

An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. Monitor...

PT-2026-83055

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An attacker with valid credentials can cause CPU consumption and subsequent service degradation or denial of service for IMAP by using the IMAP LIST command. Recommendations Update to version...

PT-2026-83058

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An attacker with valid credentials can establish multiple connections to the imap-hibernate service and send invalid commands. This action can trigger an intermittent out-of-bounds read, leading ...

PT-2026-83059

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An attacker can send a crafted email with message header values designed to collide in an internal hash table. This causes the IMAP THREAD command to consume CPU resources disproportionate to the...

PT-2026-83062

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description When IMAP compression is enabled, the compression state is reused across responses in a session. This causes response sizes to depend on both attacker-supplied mail and other mail within the same...

PT-2026-83075

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An attacker with valid credentials can send specially crafted compressed data that leads to stack exhaustion, causing the affected process to crash. This termination of the process can result in...

UBUNTU-CVE-2026-40015

An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and crash the process. The crash interrupts hibernated IMAP sessions handled by the affected process, which can cause...

UBUNTU-CVE-2026-40014

An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. Monitor...

PT-2026-83068

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An attacker with valid credentials can send an invalid IMAP URLFETCH command, causing the system to include uninitialized memory in the error response returned to the client. This can lead to the...

CVE-2026-42391: Uncontrolled Resource Consumption

An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, which causes memory and CPU usage to grow disproportionately. The login process can be terminated by the out-of-memory handling, which also terminates all other connections handled by...

CVE-2026-42391

An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, which causes memory and CPU usage to grow disproportionately. The login process can be terminated by the out-of-memory handling, which also terminates all other connections handled by...

CVE-2026-27852: Uncontrolled Resource Consumption

An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust the memory limit...

PT-2026-83067

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An unauthenticated attacker can send an IMAP ID command containing an excessive number of parameters before authentication. This action causes disproportionate growth in memory and CPU usage,...

PT-2026-83050

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.5-1.1 Description An attacker can send a crafted email with headers containing an excessive number of email addresses or MIME parameters. When the message is parsed via IMAP, it leads to excessive memory...