Detections
Analytics

Nginx 1.31.0 Buffer Overflow

critical Web App Scanning Plugin ID 115254

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Synopsis

Nginx 1.31.0 Buffer Overflow

Description

According to its Server response header, the installed version of nginx is prior to 1.30.2 or 1.31.0. It is, therefore, affected by a buffer overflow in ngx_http_rewrite_module module.

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to nginx version 1.31.1 or later.

See Also

https://my.f5.com/manage/s/article/K000161377

Plugin Details

Severity: Critical

ID: 115254

Type: Version Based

Published: 5/28/2026

Updated: 5/28/2026

Scan Template: api, basic, full, pci, scan

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: High

Base Score: 7.6

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

CVSS Score Source: CVE-2026-9256

CVSS v3

Risk Factor: High

Base Score: 8.1

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

CVSS Score Source: CVE-2026-9256

CVSS v4

Risk Factor: Critical

Base Score: 9.2

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

CVSS Score Source: CVE-2026-9256

Vulnerability Information

CPE: cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/21/2026

Reference Information

CVE: CVE-2026-9256