Alibaba Cloud Linux 3 : 0340: rsyslog (ALINUX3-SA-2026:0340)

high Nessus Plugin ID 378775

Synopsis

The remote Alibaba Cloud Linux host is missing one or more security updates.

Description

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0340 advisory.

Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

CVE-2026-19654:
A unauthenticated remote peer may lead rsyslogd to crash due to a flaw in the optional imptcp module. A crafted input sequence during oversize-frame recovery can cause an invalid internal message length and terminate rsyslogd. No confidentiality or integrity impact, privilege escalation, or code execution has been identified. imtcp and the default imptcp framing modes are not affected.

CVE-2026-78002:
A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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 packages.

Plugin Details

Severity: High

ID: 378775

File Name: alinux3_sa_2026-0340.nasl

Version: 1.1

Type: Local

Family: Alibaba Cloud Linux Local Security Checks

Published: 11/11/2026

Updated: 11/11/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.13

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-2026-78002

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:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-crypto, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-doc, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-elasticsearch, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-gnutls, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-gssapi, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-kafka, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mmaudit, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mmfields, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mmjsonparse, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mmkubernetes, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mmnormalize, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mmsnmptrapd, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-mysql, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-omamqp1, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-openssl, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-pgsql, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-relp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-snmp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog-udpspoof, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:rsyslog

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/10/2026

Vulnerability Publication Date: 8/12/2026

Reference Information

CVE: CVE-2026-19654, CVE-2026-78002

Detections

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