nginx 1.27.2 < 1.28.3 / 1.29.x < 1.29.7 OCSP Result Bypass

medium Nessus Plugin ID 306672

Synopsis

The remote web server is affected by a vulnerability.

Description

The installed version of nginx is 1.27.2 prior to 1.28.3, or 1.29.x prior to 1.29.7. It is, therefore, affected by the following issue :

- NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. (CVE-2026-28755)

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.

Plugin Details

Severity: Medium

ID: 306672

File Name: nginx_CVE-2026-28755.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: Low

Score: 3.3

CVSS v2

Risk Factor: Medium

Base Score: 5.5

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

CVSS Score Source: CVE-2026-28755

CVSS v3

Risk Factor: Medium

Base Score: 5.4

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

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-2026-28755

Detections

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