Linux Distros Unpatched Vulnerability : CVE-2026-5545

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

include('compat.inc');

if (description)
{
  script_id(311003);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/15");

  script_cve_id("CVE-2026-5545");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-5545");

  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 might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S)
    request after a Negotiate-authenticated one, when both use the same host. 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 criteria must 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. An application that first uses Negotiate authentication to a
    server with `user1:password1` and then does another operation to the same server asking for any
    authentication method but for `user2:password2` (while the previous connection is still alive) - the
    second request gets confused and wrongly reuses the same connection and sends the new request over that
    connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the
    connection authenticated for user1... (CVE-2026-5545)

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://security-tracker.debian.org/tracker/CVE-2026-5545");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-5545");
  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:P/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-5545");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/29");

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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", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04");

  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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "curl-udeb"},
          {"reference": "libcurl3"},
          {"reference": "libcurl3-dbg"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl3-udeb"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3"},
          {"reference": "libcurl3-dbg"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "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');
}