Detections
Analytics

nginx 0.5.15 < 1.28.3 / 1.29.x < 1.29.7 NULL Pointer Dereference

high Nessus Plugin ID 306673

Synopsis

The remote web server is affected by a vulnerability.

Description

The installed version of nginx is 0.5.15 prior to 1.28.3, or 1.29.x prior to 1.29.7. It is, therefore, affected by the following issue :

 - When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. (CVE-2026-27651)

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 1.28.3 / 1.29.7 or later.

See Also

https://my.f5.com/manage/s/article/K000160383

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

Plugin Details

Severity: High

ID: 306673

File Name: nginx_CVE-2026-27651.nasl

Version: 1.1

Type: Combined

Agent: unix

Family: Web Servers

Published: 4/16/2026

Updated: 4/16/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-27651

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:nginx:nginx

Required KB Items: Settings/ParanoidReport, installed_sw/nginx

Patch Publication Date: 3/24/2026

Vulnerability Publication Date: 3/24/2026

Reference Information

CVE: CVE-2026-27651