Dovecot
by Open-Xchange
Source repositories
CVEs (35)
| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2026-40015 | Med | 0.28 | 4.3 | 0.00 | Aug 28, 2026 | 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,… | ||
| CVE-2026-40013 | Med | 0.28 | 4.3 | 0.00 | Aug 28, 2026 | An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. This causes memory corruption and an observed crash of the ManageSieve process, resulting… | ||
| CVE-2026-33607 | Med | 0.28 | 4.3 | 0.00 | Aug 28, 2026 | 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… | ||
| CVE-2026-33263 | Med | 0.28 | 4.3 | 0.00 | Aug 28, 2026 | When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues. If running in high-security mode (default for community releases), only the new submission connection gets terminated. If… | ||
| CVE-2026-42006 | Med | 0.28 | 4.3 | 0.01 | May 12, 2026 | 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 there was still another way left open. In particular, the fix was for closing braces, but you could still use open… | ||
| CVE-2026-27859 | Med | 0.27 | 5.3 | 0.00 | Mar 27, 2026 | A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages,… | ||
| CVE-2026-0394 | Med | 0.27 | 5.3 | 0.00 | Mar 27, 2026 | When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is directory partial. This allows inadvertently reading… | ||
| CVE-2025-59028 | Med | 0.27 | 5.3 | 0.00 | Mar 27, 2026 | When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in… | ||
| CVE-2026-40203 | Low | 0.24 | 3.7 | 0.00 | Aug 28, 2026 | When IMAP compression is enabled, the same compression state is reused across responses in a session, so response sizes depend on both attacker-supplied mail and other mail in the same mailbox. An attacker that can send mail to a user and can also observe the sizes of that… | ||
| CVE-2026-27857 | Med | 0.21 | 4.3 | 0.01 | Mar 27, 2026 | Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect… | ||
| CVE-2025-59031 | Med | 0.21 | 4.3 | 0.00 | Mar 27, 2026 | Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments. Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and subsequently ending up in FTS indexes. Do not… | ||
| CVE-2026-52681 | Low | 0.20 | 3.1 | 0.00 | Aug 28, 2026 | 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… | ||
| CVE-2026-40204 | Low | 0.20 | 3.1 | 0.00 | Aug 28, 2026 | None None None No publicly available exploits are known. | ||
| CVE-2026-40020 | Low | 0.20 | 3.1 | 0.00 | May 12, 2026 | Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=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… | ||
| CVE-2026-27860 | Low | 0.17 | 3.7 | 0.00 | Mar 27, 2026 | If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly… |
- risk 0.28cvss 4.3epss 0.00
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,…
- risk 0.28cvss 4.3epss 0.00
An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. This causes memory corruption and an observed crash of the ManageSieve process, resulting…
- risk 0.28cvss 4.3epss 0.00
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…
- risk 0.28cvss 4.3epss 0.00
When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues. If running in high-security mode (default for community releases), only the new submission connection gets terminated. If…
- risk 0.28cvss 4.3epss 0.01
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 there was still another way left open. In particular, the fix was for closing braces, but you could still use open…
- risk 0.27cvss 5.3epss 0.00
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages,…
- risk 0.27cvss 5.3epss 0.00
When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is directory partial. This allows inadvertently reading…
- risk 0.27cvss 5.3epss 0.00
When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in…
- risk 0.24cvss 3.7epss 0.00
When IMAP compression is enabled, the same compression state is reused across responses in a session, so response sizes depend on both attacker-supplied mail and other mail in the same mailbox. An attacker that can send mail to a user and can also observe the sizes of that…
- risk 0.21cvss 4.3epss 0.01
Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect…
- risk 0.21cvss 4.3epss 0.00
Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments. Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and subsequently ending up in FTS indexes. Do not…
- risk 0.20cvss 3.1epss 0.00
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…
- risk 0.20cvss 3.1epss 0.00
None None None No publicly available exploits are known.
- risk 0.20cvss 3.1epss 0.00
Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=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…
- risk 0.17cvss 3.7epss 0.00
If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly…
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