RHEL 8 : postfix (RHSA-2026:25932)

high Nessus Plugin ID 321110

Synopsis

The remote Red Hat host is missing a security update for postfix.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:25932 advisory.

The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS.

Security Fix(es):

* postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

Solution

Update the RHEL postfix package based on the guidance in RHSA-2026:25932.

Plugin Details

Severity: High

ID: 321110

File Name: redhat-RHSA-2026-25932.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 6/15/2026

Updated: 6/15/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-43964

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:postfix-cdb, p-cpe:/a:redhat:enterprise_linux:postfix-mysql, p-cpe:/a:redhat:enterprise_linux:postfix-sqlite, p-cpe:/a:redhat:enterprise_linux:postfix-pcre, p-cpe:/a:redhat:enterprise_linux:postfix-ldap, cpe:/o:redhat:rhel_eus:8.10, p-cpe:/a:redhat:enterprise_linux:postfix-pgsql, p-cpe:/a:redhat:enterprise_linux:postfix-perl-scripts, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:postfix

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/15/2026

Vulnerability Publication Date: 5/4/2026

Reference Information

CVE: CVE-2026-43964

CWE: 193

RHSA: 2026:25932

Detections

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