nginx 1.25.0 < 1.30.6 / 1.31.x < 1.31.7 Request Body Injection

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(371393);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/23");

  script_cve_id("CVE-2026-95101");
  script_xref(name:"IAVA", value:"2026-A-1142");

  script_name(english:"nginx 1.25.0 < 1.30.6 / 1.31.x < 1.31.7 Request Body Injection");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its Server response header, the installed version of nginx is 1.25.0 prior to 1.30.6 or 1.31.0 prior to
1.31.7. It is, therefore, affected by the following issue:

  - NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When
    using HTTP/3 with proxy_request_buffering on directive, an unauthenticated attacker may be able to inject
    data in the proxied request. There is no control plane exposure; this is a data plane issue only.
    
    Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
    (CVE-2026-95101)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://my.f5.com/manage/s/article/K000162613");
  script_set_attribute(attribute:"see_also", value:"https://www.cve.org/CVERecord?id=CVE-2026-95101");
  script_set_attribute(attribute:"solution", value:
"Upgrade to nginx 1.30.6, 1.31.7 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-95101");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/23");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:nginx:nginx");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("nginx_detect.nasl", "nginx_nix_installed.nbin");
  script_require_keys("Settings/ParanoidReport", "installed_sw/nginx");

  exit(0);
}

include('vcf.inc');
include('http.inc');

# ngx_http_v3_module is not compiled by default
if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

var appname = 'nginx';
get_install_count(app_name:appname, exit_if_zero:TRUE);

var app_info = vcf::combined_get_app_info(app:appname);
vcf::check_granularity(app_info:app_info, sig_segments:3);

var constraints = [
  { 'min_version' : '1.25.0', 'fixed_version' : '1.30.6' },
  { 'min_version' : '1.31.0', 'fixed_version' : '1.31.7' }
];
vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_WARNING
);