Linux Distros Unpatched Vulnerability : CVE-2026-126077

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

include('compat.inc');

if (description)
{
  script_id(379210);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/13");

  script_cve_id("CVE-2026-126077");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-126077");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, When
    ActionDispatch::Cookies reads a signed or encrypted cookie that was written under a rotated secret
    (config.action_dispatch.cookies_rotations) or in the format that a :hybrid cookie serializer migrates
    from, it writes the cookie back to the response in the current format, and that write ignores
    request.session_options[:skip]. ActiveStorage::DisableSession relies on that option to keep the session
    cookie off the public, immutable responses of the Active Storage proxy controllers, but those controllers
    still load the session, so a request carrying an old-format session cookie could receive the rewritten
    session cookie in Set-Cookie on a cacheable response. A shared cache that stores such a response together
    with its Set-Cookie header could then serve one user's session to later requesters of the same URL, or
    serve an attacker's session to other users. Applications are affected when they serve Active Storage files
    through the proxy controllers, have a cookie rotation or a :hybrid serializer migration configured, and
    run behind a cache that stores Set-Cookie on public responses. This is a path around the fix for
    CVE-2024-26144. This issue is fixed in versions 8.1.4.1 and 8.0.5.2. (CVE-2026-126077)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-126077");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-126077");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/11/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:rails");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "rails"},
          {"reference": "ruby-actioncable"},
          {"reference": "ruby-actionmailbox"},
          {"reference": "ruby-actionmailer"},
          {"reference": "ruby-actionpack"},
          {"reference": "ruby-actiontext"},
          {"reference": "ruby-actionview"},
          {"reference": "ruby-activejob"},
          {"reference": "ruby-activemodel"},
          {"reference": "ruby-activerecord"},
          {"reference": "ruby-activestorage"},
          {"reference": "ruby-activesupport"},
          {"reference": "ruby-rails"},
          {"reference": "ruby-railties"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "rails"},
          {"reference": "ruby-actioncable"},
          {"reference": "ruby-actionmailbox"},
          {"reference": "ruby-actionmailer"},
          {"reference": "ruby-actionpack"},
          {"reference": "ruby-actiontext"},
          {"reference": "ruby-actionview"},
          {"reference": "ruby-activejob"},
          {"reference": "ruby-activemodel"},
          {"reference": "ruby-activerecord"},
          {"reference": "ruby-activestorage"},
          {"reference": "ruby-activesupport"},
          {"reference": "ruby-rails"},
          {"reference": "ruby-railties"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "rails"},
          {"reference": "ruby-actioncable"},
          {"reference": "ruby-actionmailbox"},
          {"reference": "ruby-actionmailer"},
          {"reference": "ruby-actionpack"},
          {"reference": "ruby-actiontext"},
          {"reference": "ruby-actionview"},
          {"reference": "ruby-activejob"},
          {"reference": "ruby-activemodel"},
          {"reference": "ruby-activerecord"},
          {"reference": "ruby-activestorage"},
          {"reference": "ruby-activesupport"},
          {"reference": "ruby-rails"},
          {"reference": "ruby-railties"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}