Описание
Security update for dovecot24
This update for dovecot24 fixes the following issues
- CVE-2026-27851: lib-var-expand: safe filter leaks to all following pipelines (bsc#1265146).
- CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).
- CVE-2026-40016: Sieve: contains/: matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).
- CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).
- CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).
Changes for dovecot24:
- Update to 2.4.4
Список пакетов
openSUSE Leap 16.0
Ссылки
- SUSE Security Ratings
- SUSE Bug 1265146
- SUSE Bug 1265147
- SUSE Bug 1265148
- SUSE Bug 1265149
- SUSE Bug 1265150
- SUSE CVE CVE-2026-27851 page
- SUSE CVE CVE-2026-33603 page
- SUSE CVE CVE-2026-40016 page
- SUSE CVE CVE-2026-40020 page
- SUSE CVE CVE-2026-42006 page
Описание
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 fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27851
- SUSE Bug 1265146
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
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
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
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