Open-Xchange GmbH OX Dovecot Pro

• CVE-2026-73209 Medium 6.5 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 0.4%
• CVE-2026-73208 High 7.4 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 chec 0.3%
• CVE-2026-52687 Medium 6.5 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 me 0.4%
• CVE-2026-52681 Low 3.1 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 0.3%
• CVE-2026-42395 Medium 4.3 A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login process on the following login attempt. The login process is terminated, which can cause 0.4%
• CVE-2026-42393 Low 3.1 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 the same network as the doveadm service 0.2%
• CVE-2026-42392 Medium 4.3 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 0.3%
• CVE-2026-42391 High 7.5 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 0.4%
• CVE-2026-42008 Medium 4.3 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 host can be injected as an internal authent 0.2%
• CVE-2026-42007 Critical 9.1 An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffe 0.3%
• CVE-2026-40205 Medium 5.9 An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote token validation paths 0.2%
• CVE-2026-40204 Low 3.1 None None None No publicly available exploits are known. 0.2%
• CVE-2026-40203 Low 3.7 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 att 0.3%
• CVE-2026-40018 High 7.4 None None None No publicly available exploits are known. 0.3%
• CVE-2026-40017 Medium 6.5 An attacker that can send mail to a user can craft a message header whose values are chosen to collide in an internal hash table, which makes the IMAP THREAD command consume CPU disproportionate to th 0.3%
• CVE-2026-40015 Medium 4.3 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. Th 0.6%
• CVE-2026-40014 Medium 6.5 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 comma 0.3%
• CVE-2026-40013 Medium 4.3 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 cause 0.9%
• CVE-2026-33607 Medium 4.3 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 0.6%
• CVE-2026-33606 Medium 4.8 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 protocol, for example during a migration. Injec 0.2%
• CVE-2026-33605 High 7.5 An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. If running in high-security mode (default for community releases), only 0.4%
• CVE-2026-33604 Medium 5.9 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 to bypass the outbound protection that pr 0.3%
• CVE-2026-33263 Medium 4.3 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 0.6%
• CVE-2026-27852 High 7.5 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 la 0.4%
• CVE-2026-42006 Medium 4.3 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 ope 0.6%
• CVE-2026-40020 Low 3.1 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 limi 0.3%
• CVE-2026-40016 Medium 5.3 Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degr 0.3%
• CVE-2026-33603 Medium 6.8 Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the cl 0.2%
• CVE-2026-27851 High 7.4 When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP i 0.4%
• CVE-2026-27860 Low 3.7 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. 0.3%
• CVE-2026-27859 Medium 5.3 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 t 0.4%
• CVE-2026-27858 High 7.5 Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedl 0.8%
• CVE-2026-27857 Medium 4.3 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 ti 0.7%
• CVE-2026-27856 High 7.4 Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential wil 0.4%
• CVE-2026-27855 Medium 6.8 Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP re 0.3%
• CVE-2026-24031 High 7.7 Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_u 0.4%
• CVE-2026-0394 Medium 5.3 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 doma 0.4%
• CVE-2025-59032 High 7.5 ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to 0.7%
• CVE-2025-59031 Medium 4.3 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 0.3%
• CVE-2025-59028 Medium 5.3 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 serve 0.5%
• CVE-2025-30189 High 7.4 When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent login 0.6%
• CVE-2024-23185 High 7.5 Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, i 1.3%
• CVE-2024-23184 Medium 5.0 Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observe 0.8%
• CVE-2024-25584 Medium 5.3 Dovecot accepts dot LF DOT LF symbol as end of DATA command. RFC requires that it should always be CR LF DOT CR LF. This causes Dovecot to convert single mail with LF DOT LF in middle, into two emails 0.2%