SB20260626222 - SUSE update for dovecot22

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Main Vulnerability Database SB20260626222

SB20260626222 - SUSE update for dovecot22

Published: June 26, 2026

Security Bulletin ID SB20260626222
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Improper Control of Resource Identifiers ('Resource Injection') (CVE-ID: CVE-2026-33603)

CWE-ID: CWE-99 - Improper Control of Resource Identifiers ('Resource Injection')

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to eavesdrop communications between Dovecot and a client.

The vulnerability exists due to improper control of resource identifiers in login when processing a specially crafted base64 exchange between Dovecot and the client. A remote attacker can send a specially crafted base64 exchange to eavesdrop communications between Dovecot and a client.

Exploitation requires the ability to position between Dovecot and the client connection and can be used to fake SCRAM TLS channel binding.


2) Improper access control (CVE-ID: CVE-2026-40020)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to spam folders to other users.

The vulnerability exists due to improper access control in the IMAP SETACL command when injecting the anyone permission into a user's dovecot-acl file. A remote user can use the IMAP SETACL command to spam folders to other users.

No unexpected access is gained.


3) Resource exhaustion (CVE-ID: CVE-2026-42006)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in imap-login when processing excessive bracing over IMAP. A remote user can send excessive bracing to cause a denial of service.

The issue remained reachable because an earlier fix blocked closing braces, but open braces could still bypass the limit.


Remediation

Install update from vendor's website.

References