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RHEL 10 : rsyslog (RHSA-2026:66405)

high Nessus Plugin ID 344581

Synopsis

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

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:66405 advisory.

 The rsyslog packages provide an enhanced, multi-threaded syslog daemon. It supports MySQL, syslog/TCP, RFC 3195, permitted sender lists, filtering on any message part, and fine-grained control over output format.

 Security Fix(es):

 * rsyslog: A configuration-dependent issue in rsyslog's optional imptcp input module can allow an unauthenticated remote peer to crash rsyslogd (CVE-2026-19654)

 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 rsyslog package based on the guidance in RHSA-2026:66405.

See Also

https://access.redhat.com/errata/RHSA-2026:66405

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2502868

http://www.nessus.org/u?7a39bf0a

Plugin Details

Severity: High

ID: 344581

File Name: redhat-RHSA-2026-66405.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/10/2026

Updated: 9/10/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.65

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-2026-19654

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: cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux_eus:10.0, p-cpe:/a:redhat:enterprise_linux:rsyslog-crypto, p-cpe:/a:redhat:enterprise_linux:rsyslog-doc, p-cpe:/a:redhat:enterprise_linux:rsyslog-elasticsearch, p-cpe:/a:redhat:enterprise_linux:rsyslog-gnutls, p-cpe:/a:redhat:enterprise_linux:rsyslog-gssapi, p-cpe:/a:redhat:enterprise_linux:rsyslog-kafka, p-cpe:/a:redhat:enterprise_linux:rsyslog-mmaudit, p-cpe:/a:redhat:enterprise_linux:rsyslog-mmfields, p-cpe:/a:redhat:enterprise_linux:rsyslog-mmjsonparse, p-cpe:/a:redhat:enterprise_linux:rsyslog-mmkubernetes, p-cpe:/a:redhat:enterprise_linux:rsyslog-mmnormalize, p-cpe:/a:redhat:enterprise_linux:rsyslog-mmsnmptrapd, p-cpe:/a:redhat:enterprise_linux:rsyslog-mysql, p-cpe:/a:redhat:enterprise_linux:rsyslog-omamqp1, p-cpe:/a:redhat:enterprise_linux:rsyslog-openssl, p-cpe:/a:redhat:enterprise_linux:rsyslog-pgsql, p-cpe:/a:redhat:enterprise_linux:rsyslog-relp, p-cpe:/a:redhat:enterprise_linux:rsyslog-snmp, p-cpe:/a:redhat:enterprise_linux:rsyslog-udpspoof, p-cpe:/a:redhat:enterprise_linux:rsyslog

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: 9/10/2026

Vulnerability Publication Date: 8/12/2026

Reference Information

CVE: CVE-2026-19654

CWE: 125

RHSA: 2026:66405