Linux Distros Unpatched Vulnerability : CVE-2026-1965

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

include('compat.inc');

if (description)
{
  script_id(301847);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/18");

  script_cve_id("CVE-2026-1965");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-1965");

  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.

  - libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated
    HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse
    an existing connection to avoid overhead. When reusing a connection a range of criterion must first be
    met. Due to a logical error in the code, a request that was issued by an application could wrongfully
    reuse an existing connection to the same server that was authenticated using different credentials. One
    underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary
    to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that
    responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also
    using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second
    request wrongly reused the same connection and since it then sees that the Negotiate negotiation is
    already made, it just sends the request over that connection thinking it uses the user2 credentials when
    it is in fact still using the connection authenticated for user1... The set of authentication methods to
    use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus
    mitigate this problem, by using one of the following libcurl options to alter how connections are or are
    not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using
    the curl_multi API). (CVE-2026-1965)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-1965");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-1965");
  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:L/Au:S/C:P/I:P/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:L/PR:L/UI:N/S:U/C:N/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-2026-1965");

  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:"2026/03/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/11");

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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.");

  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/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-6", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  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/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');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl4"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl4"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3t64-gnutls"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-openssl-dev"},
          {"reference": "libcurl4t64"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "cargo"},
          {"reference": "clippy"},
          {"reference": "curl"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"},
          {"reference": "libcurl-minimal"},
          {"reference": "rust"},
          {"reference": "rust-analyzer"},
          {"reference": "rust-debugger-common"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rust-std-static"},
          {"reference": "rust-std-static-aarch64-unknown-none-softfloat"},
          {"reference": "rust-std-static-wasm32-unknown-unknown"},
          {"reference": "rust-std-static-wasm32-wasip1"},
          {"reference": "rust-std-static-x86_64-unknown-none"},
          {"reference": "rust-toolset"},
          {"reference": "rust-toolset-srpm-macros"},
          {"reference": "rustfmt"},
          {"reference": "s390utils"},
          {"reference": "s390utils-base"},
          {"reference": "s390utils-chreipl-fcp-mpath"},
          {"reference": "s390utils-cmsfs-fuse"},
          {"reference": "s390utils-core"},
          {"reference": "s390utils-cpacfstatsd"},
          {"reference": "s390utils-cpuplugd"},
          {"reference": "s390utils-devel"},
          {"reference": "s390utils-hmcdrvfs"},
          {"reference": "s390utils-iucvterm"},
          {"reference": "s390utils-mon_statd"},
          {"reference": "s390utils-osasnmpd"},
          {"reference": "s390utils-se-data"},
          {"reference": "s390utils-zdsfs"},
          {"reference": "s390utils-ziomon"},
          {"reference": "snphost"},
          {"reference": "trustee"},
          {"reference": "trustee-guest-components"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"},
          {"reference": "libcurl-minimal"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"},
          {"reference": "libcurl-minimal"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "cargo"},
          {"reference": "clippy"},
          {"reference": "curl"},
          {"reference": "curl-minimal"},
          {"reference": "libcurl"},
          {"reference": "libcurl-devel"},
          {"reference": "libcurl-minimal"},
          {"reference": "rust"},
          {"reference": "rust-analysis"},
          {"reference": "rust-analyzer"},
          {"reference": "rust-debugger-common"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rust-std-static"},
          {"reference": "rust-std-static-wasm32-unknown-unknown"},
          {"reference": "rust-std-static-wasm32-wasi"},
          {"reference": "rust-toolset"},
          {"reference": "rustfmt"},
          {"reference": "snphost"},
          {"reference": "trustee-guest-components"}
        ]
      }
    ]
  }
};

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');
}