rpm package
opensuse/dovecot24&distro=openSUSE Tumbleweed
pkg:rpm/opensuse/dovecot24&distro=openSUSE%20Tumbleweed
Vulnerabilities (40)
| CVE | Sev | CVSS | KEV | Affected versions | Fixed in | Published | Description |
|---|---|---|---|---|---|---|---|
| CVE-2026-42006 | Med | 4.3 | < 2.4.4-1.1 | 2.4.4-1.1 | 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 b | |
| CVE-2026-40020 | Low | 3.1 | < 2.4.4-1.1 | 2.4.4-1.1 | 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 gained | |
| CVE-2026-40016 | Med | 5.3 | < 2.4.4-1.1 | 2.4.4-1.1 | May 12, 2026 | 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. | |
| CVE-2026-33603 | Med | 6.8 | < 2.4.4-1.1 | 2.4.4-1.1 | May 12, 2026 | 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 betwee | |
| CVE-2026-27851 | Hig | 7.4 | < 2.4.4-1.1 | 2.4.4-1.1 | May 12, 2026 | 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 injection attacks when used in authentication. Avoid using safe filter until on f | |
| CVE-2026-27860 | Low | 3.7 | < 2.4.3-1.1 | 2.4.3-1.1 | 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 ava | |
| CVE-2026-27859 | Med | 5.3 | < 2.4.3-1.1 | 2.4.3-1.1 | 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, or | |
| CVE-2026-27858 | Hig | 7.5 | < 2.4.3-1.1 | 2.4.3-1.1 | Mar 27, 2026 | 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 | |
| CVE-2026-27857 | Med | 4.3 | < 2.4.3-1.1 | 2.4.3-1.1 | 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 possi | |
| CVE-2026-27856 | Hig | 7.4 | < 2.4.3-1.1 | 2.4.3-1.1 | Mar 27, 2026 | 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 h | |
| CVE-2026-27855 | Med | 6.8 | < 2.4.3-1.1 | 2.4.3-1.1 | Mar 27, 2026 | 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 t | |
| CVE-2026-24031 | Hig | 7.7 | < 2.4.3-1.1 | 2.4.3-1.1 | Mar 27, 2026 | 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_username_chars. If this is not possible, install latest fixed version. No publicl | |
| CVE-2025-59032 | Hig | 7.5 | < 2.4.3-1.1 | 2.4.3-1.1 | Mar 27, 2026 | 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 upgr | |
| CVE-2025-59031 | Med | 4.3 | < 2.4.3-1.1 | 2.4.3-1.1 | 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 u | |
| CVE-2025-59028 | Med | 5.3 | < 2.4.3-1.1 | 2.4.3-1.1 | 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 lo | |
| CVE-2025-30189 | Hig | 7.4 | < 2.4.2-1.1 | 2.4.2-1.1 | Oct 31, 2025 | 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 logins are for same user. Install fixed version or disable caching either globally or | |
| CVE-2024-23185 | Hig | 7.5 | < 2.4.0-1.1 | 2.4.0-1.1 | Sep 10, 2024 | 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_val | |
| CVE-2024-23184 | Med | 5.0 | < 2.4.0-1.1 | 2.4.0-1.1 | Sep 10, 2024 | 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 e | |
| CVE-2020-28200 | — | < 2.4.0-1.1 | 2.4.0-1.1 | Jun 28, 2021 | The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension. | ||
| CVE-2021-33515 | — | < 2.4.0-1.1 | 2.4.0-1.1 | Jun 28, 2021 | The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address. |
- affected < 2.4.4-1.1fixed 2.4.4-1.1
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 b
- affected < 2.4.4-1.1fixed 2.4.4-1.1
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 limited to being able to spam folders to other users, no unexpected access is gained
- affected < 2.4.4-1.1fixed 2.4.4-1.1
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.
- affected < 2.4.4-1.1fixed 2.4.4-1.1
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 betwee
- affected < 2.4.4-1.1fixed 2.4.4-1.1
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 injection attacks when used in authentication. Avoid using safe filter until on f
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 ava
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 possi
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 h
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 t
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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_username_chars. If this is not possible, install latest fixed version. No publicl
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 upgr
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 u
- affected < 2.4.3-1.1fixed 2.4.3-1.1
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 lo
- affected < 2.4.2-1.1fixed 2.4.2-1.1
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 logins are for same user. Install fixed version or disable caching either globally or
- affected < 2.4.0-1.1fixed 2.4.0-1.1
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_val
- affected < 2.4.0-1.1fixed 2.4.0-1.1
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 e
- CVE-2020-28200Jun 28, 2021affected < 2.4.0-1.1fixed 2.4.0-1.1
The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.
- CVE-2021-33515Jun 28, 2021affected < 2.4.0-1.1fixed 2.4.0-1.1
The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.
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