Open-Xchange GmbH OX Dovecot CE

• 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-2026-40019 Medium 5.9 An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of servic 0.4%
• 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%