Linux Distros Unpatched Vulnerability : CVE-2026-27856

high Nessus Plugin ID 304114

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known. (CVE-2026-27856)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 304114

File Name: unpatched_CVE_2026_27856.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 3/28/2026

Updated: 4/17/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-27856

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:canonical:ubuntu_linux:dovecot, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:dovecot-pigeonhole, p-cpe:/a:centos:centos:dovecot-pgsql, p-cpe:/a:centos:centos:dovecot, p-cpe:/a:redhat:enterprise_linux:dovecot-pigeonhole, p-cpe:/a:redhat:enterprise_linux:dovecot, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:debian:debian_linux:dovecot, p-cpe:/a:centos:centos:dovecot-devel, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:dovecot-mysql, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:dovecot-mysql, p-cpe:/a:redhat:enterprise_linux:dovecot-pgsql, p-cpe:/a:redhat:enterprise_linux:dovecot-devel

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-27856

Detections

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