Описание
Security update for dovecot23
This update for dovecot23 fixes the following issues:
- CVE-2024-23184: parsing of messages containing many address headers (From, To, Cc, Bcc, etc.) could be excessively CPU intensive (bsc#1229184).
- CVE-2024-23185: large headers can cause resource exhaustion when parsing message (bsc#1229183).
- CVE-2025-59028: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).
- CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing (bsc#1260895).
- CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).
- CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).
- CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).
- CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).
- CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).
- CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication (bsc#1260901).
- CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).
- CVE-2026-33263: submission-login: Panic when mail_max_userip_connections is reached (bsc#1276794).
- CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).
- CVE-2026-33604: SMTP Smuggling via Missing Dot-Stuffing (bsc#1276802).
- CVE-2026-33605: managesieve-login: Pre-auth crash (bsc#1276809).
- CVE-2026-33606: dsync: Mail content can cause dsync protocol injection (bsc#1276800).
- CVE-2026-33607: IMAP LIST match_sub() Exponential Backtracking -- CPU Denial of Service (bsc#1276795).
- CVE-2026-40014: CPU DoS via Crafted References Header (bsc#1276804).
- CVE-2026-40015: imap-hibernate can be crashed (bsc#1276812).
- CVE-2026-40016: Sieve :contains/:matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).
- CVE-2026-40019: managesieve-login pre-auth infinite loop (bsc#1276811).
- CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).
- CVE-2026-40203: IMAP Compression Can Reveal Whether a Small Synced Email Body Matches Sender-Chosen Text (bsc#1276815).
- CVE-2026-40205: OAuth2 passdb scope enforcement bypass via OR semantics in remote validation path (bsc#1276820).
- CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).
- CVE-2026-42007: editheader RCE (bsc#1276817).
- CVE-2026-42008: XCLIENT FORWARD= bare token not namespaced (bsc#1276824).
- CVE-2026-42391: imap: Pre-login memory/CPU growth with ID command (bsc#1276835).
- CVE-2026-42393: doveadm_password or api key length can still be leaked with timing comparisons (bsc#1276827).
- CVE-2026-42395: Single NUL-Byte XCLIENT FORWARD Payload Crashes (bsc#1276826).
- CVE-2026-52681: Sieve resource usage tracking lost when active script changes (bsc#1276828).
- CVE-2026-52687: IMAP: COMPRESS ZSTD can cause excessive memory usage (bsc#1276837).
- CVE-2026-73208: auth: db-oauth2: aud claim used as fallback for missing scope claim (bsc#1276830).
- CVE-2026-73209: imap-login crash: Self-recursion on zero-output decompress chunks (bsc#1276833).
Changes for dovecot23:
- Update to version 2.3.21.1.
Список пакетов
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
SUSE Linux Enterprise Module for Server Applications 15 SP7
SUSE Linux Enterprise Server 15 SP4-LTSS
SUSE Linux Enterprise Server 15 SP5-LTSS
SUSE Linux Enterprise Server 15 SP6-LTSS
SUSE Linux Enterprise Server for SAP Applications 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15 SP6
Ссылки
- Link for SUSE-SU-2026:4139-1
- E-Mail link for SUSE-SU-2026:4139-1
- SUSE Security Ratings
- SUSE Bug 1229183
- SUSE Bug 1229184
- SUSE Bug 1260894
- SUSE Bug 1260895
- SUSE Bug 1260897
- SUSE Bug 1260898
- SUSE Bug 1260899
- SUSE Bug 1260900
- SUSE Bug 1260901
- SUSE Bug 1260902
- SUSE Bug 1265147
- SUSE Bug 1265148
- SUSE Bug 1265149
- SUSE Bug 1265150
- SUSE Bug 1276794
- SUSE Bug 1276795
- SUSE Bug 1276799
Описание
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 observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2024-23184
- SUSE Bug 1229184
Описание
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, it starts building up "full_value" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2024-23185
- SUSE Bug 1229183
Описание
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 login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2025-59028
- SUSE Bug 1260894
Описание
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 use the provided script, instead, use something else like FTS tika. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2025-59031
- SUSE Bug 1260895
Описание
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 ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2025-59032
- SUSE Bug 1260902
Описание
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 of the process and terminate it, causing denial of service for the affected user. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27852
- SUSE Bug 1276792
- SUSE Bug 1276799
Описание
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 reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27855
- SUSE Bug 1260900
Описание
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 will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27856
- SUSE Bug 1260899
Описание
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 possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Install fixed version, there is no other remediation. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27857
- SUSE Bug 1260898
- SUSE Bug 1265150
Описание
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 repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27858
- SUSE Bug 1260901
Описание
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, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27859
- SUSE Bug 1260897
Описание
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 running in high-performance mode (default for Pro releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure for user to send a message, or it can cause duplicate messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries cannot happen, because the crash can only happen at AUTH stage. Limit the number of connections handled by single submission-login process. This has a performance impact though. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-33263
- SUSE Bug 1276792
- SUSE Bug 1276794
Описание
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 client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-33603
- SUSE Bug 1265147
Описание
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 prevents message content from being interpreted as SMTP commands. A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP commands, allowing injection of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-33604
- SUSE Bug 1276792
- SUSE Bug 1276802
Описание
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 the attacker's own connection is terminated. If running in high-performance mode (default for Pro releases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause denial of service for Sieve script management. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-33605
- SUSE Bug 1276792
- SUSE Bug 1276809
Описание
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. Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-33606
- SUSE Bug 1276792
- SUSE Bug 1276800
Описание
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 known.
Затронутые продукты
Ссылки
- CVE-2026-33607
- SUSE Bug 1276792
- SUSE Bug 1276795
Описание
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 system for abnormal CPU usage, kill the offending process and remove the offending message from the affected mailbox. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40014
- SUSE Bug 1276792
- SUSE Bug 1276804
- SUSE Bug 1276813
Описание
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 degradation of service for IMAP. Disable IMAP hibernation. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40015
- SUSE Bug 1276792
- SUSE Bug 1276812
Описание
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 degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40016
- SUSE Bug 1265148
Описание
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 service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40019
- SUSE Bug 1276792
- SUSE Bug 1276811
Описание
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 gained. Install to fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40020
- SUSE Bug 1265149
Описание
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 user's IMAP traffic can confirm whether the body of a small message matches a guessed text. Recovery of arbitrary unknown content was not demonstrated, but the attack can disclose whether a secret-like message body matches a candidate. Disable IMAP compression. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40203
- SUSE Bug 1276792
- SUSE Bug 1276815
Описание
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 accept a token that carries only one of them, while the local token validation path correctly requires all of them. The configured authorization policy is not enforced, so a token that was granted only part of the required permissions is accepted where it should have been rejected. Use local token validation where tokens can be validated locally. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-40205
- SUSE Bug 1276792
- SUSE Bug 1276820
Описание
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 braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-42006
- SUSE Bug 1265150
Описание
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 buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-42007
- SUSE Bug 1276792
- SUSE Bug 1276817
Описание
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 authentication field. Any host permitted to act as a trusted proxy can authenticate as any user without knowing that user's password. This affects deployments whose password database honours a field that permits authentication without a password. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-42008
- SUSE Bug 1276792
- SUSE Bug 1276824
Описание
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 the same process. This can cause degradation or denial of service for IMAP logins. Limit the number of connections handled by a single imap-login process. This has a performance impact though. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-42391
- SUSE Bug 1276792
- SUSE Bug 1276835
Описание
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, able to make repeated requests and measure response timing accurately, can learn the length of the secret, which reduces the effort needed to guess it. The secret value itself is not disclosed. Restrict network access to the doveadm service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-42393
- SUSE Bug 1276792
- SUSE Bug 1276827
Описание
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 degradation or denial of service for logins. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-42395
- SUSE Bug 1276792
- SUSE Bug 1276826
Описание
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, allowing sustained CPU consumption, and the leftover files increase disk consumption. Both can cause degradation of service for mail delivery. Monitor system for abnormal CPU usage and disk consumption. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-52681
- SUSE Bug 1276792
- SUSE Bug 1276828
Описание
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 connections it handles, which can cause degradation or denial of service for IMAP. Disable IMAP compression. Alternatively limit the number of connections handled by a single imap-login process, though this has a performance impact. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-52687
- SUSE Bug 1276792
- SUSE Bug 1276837
Описание
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 does not describe what a token is allowed to do. A token that grants no relevant permissions can be accepted because its intended recipient value happens to match a configured scope name, granting access that should have been denied. It also hides an identity provider misconfiguration where scopes are not being issued at all. Ensure the identity provider issues a scope claim for all tokens used with Dovecot, and that configured scope names do not match audience values. Update to non-vulnerable version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-73208
- SUSE Bug 1276792
- SUSE Bug 1276830
Описание
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 are known.
Затронутые продукты
Ссылки
- CVE-2026-73209
- SUSE Bug 1276792
- SUSE Bug 1276833