Detections
Analytics

nginx 1.3.0 < 1.28.2 / 1.29.x < 1.29.5 SSL Upstream Injection

medium Nessus Plugin ID 304671

Synopsis

The remote web server is affected by a vulnerability.

Description

According to its Server response header, the installed version of nginx is 1.3.0 prior to 1.28.2, or 1.29.x prior to 1.29.5. It is, therefore, affected by the following issue :

 - A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side--along with conditions beyond the attacker's control--may be able to inject plain text data into the response from an upstream proxied server. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
 (CVE-2026-1642)

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

Solution

Upgrade to nginx 1.28.2 / 1.29.5 or later.

See Also

https://nginx.org/en/security_advisories.html

https://my.f5.com/manage/s/article/K000159824

Plugin Details

Severity: Medium

ID: 304671

File Name: nginx_CVE-2026-1642.nasl

Version: 1.2

Type: Combined

Agent: unix

Family: Web Servers

Published: 4/2/2026

Updated: 4/3/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.1

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

CVSS Score Source: CVE-2026-1642

CVSS v3

Risk Factor: Medium

Base Score: 5.9

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

Vulnerability Information

CPE: cpe:/a:igor_sysoev:nginx

Required KB Items: installed_sw/nginx

Patch Publication Date: 2/4/2026

Vulnerability Publication Date: 2/4/2026

Reference Information

CVE: CVE-2026-1642

IAVA: 2026-A-0280