Bug 2452175 (CVE-2026-27858) - CVE-2026-27858 dovecot: denial of service via crafted message before authentication
Summary: CVE-2026-27858 dovecot: denial of service via crafted message before authenti...
Keywords:
Status: NEW
Alias: CVE-2026-27858
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2452240 2452242 2452241
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 09:02 UTC by OSIDB Bzimport
Modified: 2026-05-18 12:34 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:13498 0 None None None 2026-05-04 13:48:47 UTC
Red Hat Product Errata RHSA-2026:13830 0 None None None 2026-05-05 17:11:53 UTC
Red Hat Product Errata RHSA-2026:13857 0 None None None 2026-05-05 19:18:29 UTC
Red Hat Product Errata RHSA-2026:17602 0 None None None 2026-05-14 14:00:46 UTC
Red Hat Product Errata RHSA-2026:17625 0 None None None 2026-05-14 15:10:20 UTC
Red Hat Product Errata RHSA-2026:17626 0 None None None 2026-05-14 15:25:00 UTC
Red Hat Product Errata RHSA-2026:17628 0 None None None 2026-05-14 15:14:07 UTC
Red Hat Product Errata RHSA-2026:17630 0 None None None 2026-05-14 15:02:28 UTC
Red Hat Product Errata RHSA-2026:18053 0 None None None 2026-05-18 12:34:14 UTC

Description OSIDB Bzimport 2026-03-27 09:02:09 UTC 
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 version. No publicly available exploits are known.
Comment 2 errata-xmlrpc 2026-05-04 13:48:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:13498 https://access.redhat.com/errata/RHSA-2026:13498
Comment 3 errata-xmlrpc 2026-05-05 17:11:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:13830 https://access.redhat.com/errata/RHSA-2026:13830
Comment 4 errata-xmlrpc 2026-05-05 19:18:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:13857 https://access.redhat.com/errata/RHSA-2026:13857
Comment 5 errata-xmlrpc 2026-05-14 14:00:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:17602 https://access.redhat.com/errata/RHSA-2026:17602
Comment 6 errata-xmlrpc 2026-05-14 15:02:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:17630 https://access.redhat.com/errata/RHSA-2026:17630
Comment 7 errata-xmlrpc 2026-05-14 15:10:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:17625 https://access.redhat.com/errata/RHSA-2026:17625
Comment 8 errata-xmlrpc 2026-05-14 15:14:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:17628 https://access.redhat.com/errata/RHSA-2026:17628
Comment 9 errata-xmlrpc 2026-05-14 15:24:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:17626 https://access.redhat.com/errata/RHSA-2026:17626
Comment 10 errata-xmlrpc 2026-05-18 12:34:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:18053 https://access.redhat.com/errata/RHSA-2026:18053
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