Detections
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Fedora 43 : dovecot (2026-693373747f)

critical Nessus Plugin ID 318284

Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-693373747f advisory.

 * CVE-2026-27851: lib-var-expand: Safe filter marks all following pipelines safe.
 * CVE-2026-33603: auth: CRAM-SHA-*-PLUS channel binding could be faked.
 MITM attacker with a certificate trusted by the client could have bypassed the requirement for channel binding.
 * CVE-2026-40020: IMAP folders can be shared-spammed to everyone.
 * CVE-2026-42006: An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete.
 * indexer-worker, quota-status, script-login, program-client-local: Root privileges are now dropped permanently before serving requests.
 * indexer-worker: Default restart_request_count changed to 1 to work correctly after permanent root privilege drop.
 * lmtp: Add back service_extra_groups=$SET:default_internal_group that was incorrectly removed in v2.4.3.
 * master: inet_listener_reuse_port has been replaced by service_reuse_port.
 The new setting properly pre-creates all listener sockets at startup and assigns one unique socket per process. Using this allows evenly distributing incoming connections to login processes.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected 1:dovecot package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-693373747f

Plugin Details

Severity: Critical

ID: 318284

File Name: fedora_2026-693373747f.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/3/2026

Updated: 6/3/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-27851

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:fedoraproject:fedora:dovecot, cpe:/o:fedoraproject:fedora:43

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 5/18/2026

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-27851, CVE-2026-27857, CVE-2026-33603, CVE-2026-40016, CVE-2026-40020, CVE-2026-42006