Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : nginx vulnerabilities (USN-8458-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8458-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(322264);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/23");

  script_cve_id("CVE-2026-42055", "CVE-2026-48142");
  script_xref(name:"IAVA", value:"2026-A-0601");
  script_xref(name:"USN", value:"8458-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : nginx vulnerabilities (USN-8458-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8458-1 advisory.

    It was discovered that nginx incorrectly handled large headers when proxying HTTP/2 traffic. A remote
    attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly
    execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability
    to a denial of service. (CVE-2026-42055)

    It was discovered that nginx incorrectly handled character set conversion under certain circumstances. A
    remote attacker could possibly use this issue to obtain sensitive information or cause nginx to crash,
    resulting in a denial of service. (CVE-2026-48142)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-8458-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"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");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42055");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-auth-pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-cache-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-dav-ext");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-echo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-fancyindex");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-headers-more-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-image-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-ndk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-subs-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-uploadprogress");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-upstream-fair");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-xslt-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-mail");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-nchan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-rtmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-extras");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-light");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-auth-pam', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-cache-purge', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-dav-ext', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-echo', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-fancyindex', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-geoip', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-geoip2', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-headers-more-filter', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-image-filter', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-ndk', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-perl', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-subs-filter', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-uploadprogress', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-upstream-fair', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-http-xslt-filter', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-mail', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-nchan', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-rtmp', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-stream', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-stream-geoip', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'libnginx-mod-stream-geoip2', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'nginx', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'nginx-common', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'nginx-core', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'nginx-extras', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'nginx-full', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '22.04', 'pkgname': 'nginx-light', 'pkgver': '1.18.0-6ubuntu14.16'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-http-geoip', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-http-image-filter', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-http-perl', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-http-xslt-filter', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-mail', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-stream', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'libnginx-mod-stream-geoip', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx-common', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx-core', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx-dev', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx-extras', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx-full', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '24.04', 'pkgname': 'nginx-light', 'pkgver': '1.24.0-2ubuntu7.13'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-http-geoip', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-http-image-filter', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-http-perl', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-http-xslt-filter', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-mail', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-stream', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'libnginx-mod-stream-geoip', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx-common', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx-core', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx-dev', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx-extras', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx-full', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '25.10', 'pkgname': 'nginx-light', 'pkgver': '1.28.0-6ubuntu1.8'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-http-geoip', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-http-image-filter', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-http-perl', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-http-xslt-filter', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-mail', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-stream', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'libnginx-mod-stream-geoip', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx-common', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx-core', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx-dev', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx-extras', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx-full', 'pkgver': '1.28.3-2ubuntu1.6'},
    {'osver': '26.04', 'pkgname': 'nginx-light', 'pkgver': '1.28.3-2ubuntu1.6'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libnginx-mod-http-auth-pam / libnginx-mod-http-cache-purge / etc');
}