Linux Distros Unpatched Vulnerability : CVE-2026-42245

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

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  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/09");

  script_cve_id("CVE-2026-42245");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-42245");

  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.

  - Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to
    versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading
    large responses containing many string literals. A hostile server can send responses which are crafted to
    exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24,
    0.5.14, and 0.6.4. (CVE-2026-42245)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-42245");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
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  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42245");

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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/20");

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  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.");

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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/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "11",
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          {"reference": "rubygem-openssl"},
          {"reference": "rubygem-pg"},
          {"reference": "rubygem-pg-doc"},
          {"reference": "rubygem-power_assert"},
          {"reference": "rubygem-psych"},
          {"reference": "rubygem-racc"},
          {"reference": "rubygem-rake"},
          {"reference": "rubygem-rbs"},
          {"reference": "rubygem-rdoc"},
          {"reference": "rubygem-rexml"},
          {"reference": "rubygem-rss"},
          {"reference": "rubygem-test-unit"},
          {"reference": "rubygem-typeprof"},
          {"reference": "rubygem-xmlrpc"},
          {"reference": "rubygems"},
          {"reference": "rubygems-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "ruby"},
          {"reference": "ruby-default-gems"},
          {"reference": "ruby-devel"},
          {"reference": "ruby-doc"},
          {"reference": "ruby-libs"},
          {"reference": "rubygem-bigdecimal"},
          {"reference": "rubygem-bundler"},
          {"reference": "rubygem-io-console"},
          {"reference": "rubygem-irb"},
          {"reference": "rubygem-json"},
          {"reference": "rubygem-minitest"},
          {"reference": "rubygem-power_assert"},
          {"reference": "rubygem-psych"},
          {"reference": "rubygem-rake"},
          {"reference": "rubygem-rbs"},
          {"reference": "rubygem-rdoc"},
          {"reference": "rubygem-rexml"},
          {"reference": "rubygem-rss"},
          {"reference": "rubygem-test-unit"},
          {"reference": "rubygem-typeprof"},
          {"reference": "rubygems"},
          {"reference": "rubygems-devel"}
        ]
      }
    ]
  }
};

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

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