Alibaba Cloud Linux 3 : 0114: nginx:1.20 (ALINUX3-SA-2026:0114)

critical Nessus Plugin ID 315137

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 a vulnerability as referenced in the ALINUX3-SA-2026:0114 advisory.

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

CVE-2026-42945:
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_modulemodule. This vulnerability exists when the rewritedirective is followed by a rewrite, if, or setdirective and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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

Plugin Details

Severity: Critical

ID: 315137

File Name: alinux3_sa_2026-0114.nasl

Version: 1.1

Type: Local

Family: Alibaba Cloud Linux Local Security Checks

Published: 5/18/2026

Updated: 5/18/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 6

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

CVSS Score Source: CVE-2026-42945

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.2

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-perl, cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-mail, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-image-filter, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-all-modules, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-stream, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-filesystem, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-xslt-filter

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/15/2026

Vulnerability Publication Date: 5/13/2026

Reference Information

CVE: CVE-2026-42945

Detections

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