SUSE-SU-2026:2645-1 Security update for dovecot22

This update for dovecot22 fixes the following issues - CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection bsc1265147. - CVE-2026-40020: IMAP folders can be shared-spammed to everyone bsc1265149. - CVE-2026-42006: imap-login: uncontrolled memory usage with excessive...

CVE-2026-42006

A flaw was found in Dovecot. A remote attacker can exploit this vulnerability by sending excessive open braces over the Internet Message Access Protocol IMAP, leading to uncontrolled memory usage. This can cause the affected system to consume memory up to its configured limit, resulting in a Deni...

USN-8365-1: Dovecot vulnerabilities

It was discovered that Dovecot incorrectly treated some variable expansion pipelines as safe in authentication filters. An attacker could possibly use this issue to perform SQL or LDAP injection attacks. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. CVE-2026-27851 It was discovered...

CLSA-2026-1779360319 dovecot: Fix of CVE-2026-42006

CVE-2026-42006: fix imap-login listcountlimit to actually limit open '' characters; the previous fix limited closing '' instead, leaving the bracing memory exhaustion vector open...

SUSE CVE-2026-42006

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 t...

EUVD-2026-29473

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 t...

AZL-86811 CVE-2026-42006 affecting package dovecot 2.3.20-1

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 braces to bypass t...

UBUNTU-CVE-2026-42006

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 t...

CVE-2026-42006

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 t...

CVE-2026-42006

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 t...

CVE-2026-42006

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 t...

CVE-2026-42006

CVE-2026-42006 affects Dovecot IMAP servers; the issue is uncontrolled memory usage caused by excessive bracing over IMAP, arising from an incomplete fix to CVE-2026-27857. Public advisories across multiple distros (Debian, Ubuntu, Fedora, SUSE) document vulnerable dovecot packages and partial/ne...

CVE-2026-42006

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 t...

PT-2026-40030

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.4-1.1 Description An attacker can cause uncontrolled memory usage via excessive bracing over IMAP. A previous fix was incomplete as it only blocked closing braces, allowing the memory limit to be bypassed using op...