Upstream information

CVE-2026-27857 at MITRE

Description

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

SUSE Bugzilla entry: 1260898 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 10
  • dovecot >= 2.3.21-16.el10_1.1
  • dovecot-devel >= 2.3.21-16.el10_1.1
  • dovecot-mysql >= 2.3.21-16.el10_1.1
  • dovecot-pgsql >= 2.3.21-16.el10_1.1
  • dovecot-pigeonhole >= 2.3.21-16.el10_1.1
 Patchnames:
RHSA-2026:13498
SUSE Liberty Linux 8
  • dovecot >= 2.3.16-7.el8_10
  • dovecot-devel >= 2.3.16-7.el8_10
  • dovecot-mysql >= 2.3.16-7.el8_10
  • dovecot-pgsql >= 2.3.16-7.el8_10
  • dovecot-pigeonhole >= 2.3.16-7.el8_10
 Patchnames:
RHSA-2026:13830
SUSE Liberty Linux 9
  • dovecot >= 2.3.16-15.el9_7.1
  • dovecot-devel >= 2.3.16-15.el9_7.1
  • dovecot-mysql >= 2.3.16-15.el9_7.1
  • dovecot-pgsql >= 2.3.16-15.el9_7.1
  • dovecot-pigeonhole >= 2.3.16-15.el9_7.1
 Patchnames:
RHSA-2026:13857
SUSE Linux Enterprise Server 12 SP5-LTSS
  • dovecot22 >= 2.2.31-19.32.1
  • dovecot22-backend-mysql >= 2.2.31-19.32.1
  • dovecot22-backend-pgsql >= 2.2.31-19.32.1
  • dovecot22-backend-sqlite >= 2.2.31-19.32.1
  • dovecot22-devel >= 2.2.31-19.32.1
 Patchnames:
SUSE-SLE-SERVER-12-SP5-LTSS-2026-1641
SUSE Linux Enterprise Server 16.0
SUSE Linux Enterprise Server for SAP applications 16.0
  • dovecot24 >= 2.4.3-160000.1.1
  • dovecot24-backend-mysql >= 2.4.3-160000.1.1
  • dovecot24-backend-pgsql >= 2.4.3-160000.1.1
  • dovecot24-backend-sqlite >= 2.4.3-160000.1.1
  • dovecot24-devel >= 2.4.3-160000.1.1
  • dovecot24-fts >= 2.4.3-160000.1.1
  • dovecot24-fts-solr >= 2.4.3-160000.1.1
 Patchnames:
SUSE-SLES-16.0-577
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5
  • dovecot22 >= 2.2.31-19.32.1
  • dovecot22-backend-mysql >= 2.2.31-19.32.1
  • dovecot22-backend-pgsql >= 2.2.31-19.32.1
  • dovecot22-backend-sqlite >= 2.2.31-19.32.1
  • dovecot22-devel >= 2.2.31-19.32.1
 Patchnames:
SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-1641
openSUSE Leap 16.0
  • dovecot24 >= 2.4.3-160000.1.1
  • dovecot24-backend-mysql >= 2.4.3-160000.1.1
  • dovecot24-backend-pgsql >= 2.4.3-160000.1.1
  • dovecot24-backend-sqlite >= 2.4.3-160000.1.1
  • dovecot24-devel >= 2.4.3-160000.1.1
  • dovecot24-fts >= 2.4.3-160000.1.1
  • dovecot24-fts-flatcurve >= 2.4.3-160000.1.1
  • dovecot24-fts-solr >= 2.4.3-160000.1.1
 Patchnames:
openSUSE-Leap-16.0-577
openSUSE Tumbleweed
  • dovecot24 >= 2.4.3-1.1
  • dovecot24-backend-mysql >= 2.4.3-1.1
  • dovecot24-backend-pgsql >= 2.4.3-1.1
  • dovecot24-backend-sqlite >= 2.4.3-1.1
  • dovecot24-devel >= 2.4.3-1.1
  • dovecot24-fts >= 2.4.3-1.1
  • dovecot24-fts-flatcurve >= 2.4.3-1.1
  • dovecot24-fts-solr >= 2.4.3-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10442

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise Server 16.0
  • dovecot24 >= 2.4.3-160000.1.1
  • dovecot24-backend-mysql >= 2.4.3-160000.1.1
  • dovecot24-backend-pgsql >= 2.4.3-160000.1.1
  • dovecot24-backend-sqlite >= 2.4.3-160000.1.1
  • dovecot24-devel >= 2.4.3-160000.1.1
  • dovecot24-fts >= 2.4.3-160000.1.1
  • dovecot24-fts-solr >= 2.4.3-160000.1.1

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Server 16.0 dovecot24 In progress
SUSE Linux Enterprise Server for SAP applications 16.0 dovecot24 Released
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise Server 12 SP5-LTSS dovecot22 Released
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 dovecot22 Released

SUSE Timeline for this CVE

CVE page created: Fri Mar 27 12:03:59 2026
CVE page last modified: Fri May 8 12:08:49 2026